Formal Attire 101: What to Wear to a Formal Wedding

So, you received an invitation to a wedding, and it requires "formal attire." While this is one of the most popular picks on the dress code spectrum, you might still be stumped on what to wear to a formal wedding and how it differs from other formalwear, like black tie or cocktail. To give you a helping hand, we tapped a few experts to break down formal attire for weddings, including what it means, what to wear (and what to avoid) and how to accessorize. Plus, we've rounded up outfit examples—including dresses, suits and tuxedos—that you can shop on the spot. Read on for our expert advice.

In this article:

• What Is Formal Attire for a Wedding?
• Where to Buy Formal Wedding Attire
• Women's Formal Attire for Weddings
• Men's Formal Attire for Weddings

What Is Formal Attire for a Wedding?

"Formal wedding attire sits between cocktail and black tie on the wedding dress code scale. It's slightly more elevated than cocktail attire and a touch less dressy than black-tie nuptials," says Alex Rivera, a stylist at Stitch Fix, a personal styling service. Formal wedding attire (similar to black-tie optional attire) offers a bit more flexibility than black tie, so ankle-length dresses and dressy separates are acceptable, as well as fitted, darker-hued suits paired with a crisp white button-down and tie. "If nothing else, make sure your dress is full-length," says Caitlin Elabassi, designer for Petal & Pup. "This is one of the most important elements when it comes to a formal dress code."

Photos, clockwise: Naeem Khan, Marchesa Notte, Nardos, Rebecca Vallance, Ralph Lauren, Badgley Mischa,Design: Ashley Detmering for The Knot

While shopping for a formal attire wedding, start by considering the venue and season. "These two important details will help provide an idea for the ambiance, the couple's personal taste, and ensure you've dressed appropriately for the occasion," explains Rivera. For summer events, lighter fabrics and brighter colors are common for formal attire. On the flip side—if you're attending a winter wedding—darker shades, thicker fabrics and longer sleeves are the way to go. Prioritize seasonally appropriate pieces that are elevated and fancy, but still feel like you.

Unlike black-tie attire, you have much more flexibility when it comes to colors and embellishments. "Don't be afraid to have a little fun with your fashion either through color or a playful print," says bridal stylist Gabrielle Hurwitz. "I also love the idea of a jumpsuit, suit or a patterned suit or a tuxedo with a standard necktie rather than a bow tie." As for accessories, Hurwitz says details like colorful shoes, patterned ties, statement jewelry or fun sunglasses (for outdoor weddings) are all ways to add personality to your ensemble.

Overall, pick an outfit that you truly love and feel your best in, while still being respectful of the couple's attire request. As for colors to avoid for formal weddings, steer clear of "white, ivory, cream, or champagne-colored dresses and light-colored suits," says Rivera. Elabassi echoes this formal wedding attire rule: "As long as it's not white, most colors are safe. Guests can have much more fun with color, and many people are no longer following the traditional 'rules' of the past. If you're ever unsure, it's always best to check with the couple." You should also avoid pieces that may read as too casual, such as a "cotton sundress or sports coat with chino pants," advises Hurwitz.

Now that you're familiar with formal wedding attire and what it means, it's time to dive into our top outfit picks. With the guidance of our experts, we've searched high and low for the best formal wedding outfits for every style, from chic black jumpsuits to sleek patterned suits.

Where to Buy Formal Wedding Attire

To help kickstart your shopping process, read on for a few of our go-to retailers for formal wedding guest attire.

Lulus

When it comes to affordable wedding attire, Lulus has you covered for any dress code—but especially formal. The retailer offers a range of floor-length dresses ranging from sizes XXS to 3X, many of which ring up under $100. Whether you want an outfit that's elegant and classic or something trend-forward and fun, you'll find it at Lulus.

Use code THEKNOT25 for 25% off your first purchase at Lulus (new customers only; select wedding categories; terms apply).

Reformation

While Reformation's dresses can fall on the pricier side (around $300), they're the kind you'll keep and wear for seasons to come. Specializing in silky styles, on-trend silhouettes and fun floral prints, this brand's formal attire options scream "cool girl." The best part? Many of the dresses are available in petite and extended sizes too.

Anthropologie

Anthropologie is a go-to destination for formal wedding attire, offering a dedicated guest section on its site with looks from elevated labels like BHLDN, V. Chapman, Mac Duggal and Elliatt. While you'll find styles fit for any dress code, the retailer has an impressive selection of formal options. Prices hover between $150-$400, and you'll find sizes up to 22W.

Petal & Pup

The romantic and whimsical styles at Petal & Pup are gorgeous options for formal weddings, especially those with niche dress codes (like "garden party chic" or "vibrant tropical"). With fast, reliable shipping, affordable prices—most styles fall under $150—and an ever-evolving catalogue of trend-forward styles, you're sure to find the perfect formal wedding attire for a special event.

Use code PETALXKNOT to get 15% off your purchase.

The Black Tux

If you're not looking to splurge on a brand-new tux or suit, The Black Tux is an excellent option. The retailer offers a range of rental styles starting at $149, including everything from classic black tuxedos to playful, statement-making suits. Just fill out a quick fit survey, then try on different styles in the comfort of your own home. Prefer an in-person experience? Visit one of their many nationwide showrooms and get fitted by an expert.

Suitsupply

If you want a tux or suit that feels like it was made for you, look no further than Suitsupply. The retailer specializes in custom suits tailored to perfection in over 1,000 fine Italian fabrics, crafted and delivered within two to three weeks of placing your order. Prices for premade options start at $598 and increase depending on customizations.

SuitShop

If you're looking for formal wedding attire on a budget, SuitShop is one retailer you'll definitely want to consider. Offering ownership at rental prices, costs for suits start at just $199. Beyond their affordability, the suits are size- and gender-inclusive, meaning you can find an outfit crafted for your sense of style. Beyond suits and tuxedos, they also offer vests, jackets, dress pants and accessories.

Indochino

With the help of Indochino's stylists in-store or online, you'll design your dream suit from scratch, choosing your preferred fabrics, colors, lining materials, buttons, pocket placements and more. All customizations are complimentary and included in the cost, allowing you to fine-tune every detail of your garment. This is a great place to shop for formal wedding attire if you're looking to invest in a closet staple that'll carry you through multiple special events.

Women's Formal Attire for Weddings

Formal wedding guest dresses include both floor-grazing gowns and elegant ankle-length frocks, so pick the hemline you feel best in. That being said, you don't have to wear a dress at all. "A jumpsuit is the perfect alternative to a dress and will provide ultimate comfort for a busy day of wedding festivities," says Rivera. Suits and other dressy separates can also work for this wedding dress code. Check out our favorite formal wedding attire styles below.

Lulus Melora Black Sleeveless Maxi Dress

Photo: Lulus

This Lulus gown is the definition of formal wedding attire. The dress is ultra-flattering and comfortable thanks to the stretch crepe fabric. It has an elegant sleeveless silhouette, a deep V-neckline and a floor-length skirt for the perfect dose of sophistication.

Use code THEKNOT25 for 25% off your first purchase at Lulus (new customers only; select categories; terms apply).

BHLDN Amelia Deep-V Flutter-Sleeve Satin A-Line Gown

Photo: Anthropologie

Crafted from sleek satin charmeuse, this BHLDN dress is available in sizes XXS to 3XL and boasts a dramatic V-neckline, a flattering A-line silhouette and voluminous flutter sleeves. It comes in a range of different prints colors, making it a foolproof wedding guest dress for any season and venue.

Reformation Oren Silk Dress

Photo: Reformation

This Reformation number is the "it" girl of formal wedding guest dresses. From the effortless column silhouette to the cascading scarf, you'll look undeniably elegant in this maxi-length pick. As for colors, you can choose from a range of prints and solids.

Petal & Pup Nakita Halter-Neck Maxi Dress

Photo: Petal & Pup

The rich, chocolate brown hue of this halter-neck maxi dress makes it an on-trend option for a formal wedding. The open back features a romantic bow tie detail to cinch your silhouette. Plus, at under $100, you can't beat the price.

Use code PETALXKNOT to get 15% off your purchase.

LPA Emery Velvet Maxi Dress

Photo: REVOLVE

For a formal wedding in the fall or winter, a classic black gown is a great way to go. This one has a cool square neckline and luxe velvet fabric, lending itself well to a range of styling possibilities. Keep it simple with all-black accessories, or give it a festive feel with a metallic bag and pumps.

Betsy & Adam Ruffle Long Sleeve Sheath Gown

Photo: Nordstrom

This formal wedding guest dress is a stunning choice for fall or winter nuptials. The highlights of this piece are the mock neckline, comfortable stretch fabric and ruched details that flow into a frilly ruffle down the skirt. We love it in this deep green shade, but you can also snag it in black.

ELOQUII Off-the-Shoulder Cuff Detail Maxi Dress

Photo: ELOQUII

This stunning off-the-shoulder number from ELOQUII is sure to impress at your next formal wedding. With its body-skimming silhouette and dramatic statement sleeves, you'll be getting compliments left and right.

BHLDN Emma High-Neck Satin Maxi Gown

Photo: Anthropologie

Available in eight colors, this formal wedding attire dress from Anthropologie can fit any season. (Think: butter yellow for summer, forest green for fall, navy for winter, and blush for spring.) The dress features an elegant high neckline, asymmetrical side ruching and a leg slit.

Lulus Satin Asymmetrical Maxi Dress

Photo: Lulus

Customers rave about this formal wedding guest dress from Lulus, which features a high neckline and asymmetrical bodice with gathering at the bustline. It has over 60 rave reviews and a stellar 4.4-star rating.

Use code THEKNOT25 for 25% off your first purchase at Lulus (new customers only; select wedding categories; terms apply).

Petal & Pup Desirae Maxi Dress

Photo: Petal & Pup

This rich, burgundy wedding guest dress has a feminine off-the-shoulder neckline and figure-skimming silhouette. Pair it with gold jewelry and a set of neutral heels to complete your formal wedding guest attire.

Use code PETALXKNOT to get 15% off your purchase.

Men's Formal Attire for Weddings

Formal weddings are great because the dress code is fancy but still flexible. Men can wear a tuxedo, but they don't have to—a dark suit and tie are also appropriate. Dress shoes fit the bill when it comes to footwear. Consider patent leather loafers for a tux or laced oxfords for a suit. A formal wedding is also the perfect time to break out the cuff links. "Pair them with a French cuff (a shirt with a double cuff), and make sure your sleeve extends slightly past the length of your jacket so the cufflinks are visible," says Rivera.

Bonobos Jetsetter Wool Suit

Photo: Bonobos

Made with Italian wool that has a hint of stretch for comfort, this classic navy suit will become a staple for formal weddings of any season. And with three different blazer styles and four different pant options, getting that just-right fit is a breeze.

The Black Tux Charcoal Suit

Photo: The Black Tux

Charcoal grey is another foolproof color choice for formal weddings. Crafted from 100% super-fine Italian merino wool, this suit has pants available in both regular and slim fits. The best part? The Black Tux makes shopping for formal attire easy with the option to rent or buy, depending on your preference.

Jack Victor Elwood Contemporary Fit Black Wool Tuxedo

Photo: Nordstrom

You can't go wrong with a timeless black tuxedo for men's formal wedding attire, and this top-rated option comes in regular and big sizes. From the peak lapels to the luxurious silk accents, you'll be the best-dressed guest at the party. Elevate your outfit with a bow tie and a pair of dressy oxfords or loafers.

Banana Republic Italian Windowpane Suit

Photo: Banana Republic

When it comes to expressing your personal style through men's formal wedding attire, consider a dark suit with a subtle pattern, like this stylish windowpane ensemble. It's made with a gorgeous recycled wool-blend from Italy, which is sure to keep you warm at a wedding in the fall or winter.

SuitShop Olive Green Tweed Suit

Photo: SuitShop

If you don't want to add another black suit to your closet, olive green is a great alternative color option for formal attire (though this particular style also comes in brown, burnt orange, burgundy, navy or gray). This dapper pick from SuitShop is crafted with textured wool and a classic notch lapel, and it'll look stunning whether you're headed to a rooftop wedding in the city or an intimate affair in the countryside.

Tommy Hilfiger Wool Blend Tuxedo

Photo: Men's Wearhouse

Swapping your traditional black tuxedo for something in navy blue is a great choice for a formal wedding—it still feels dressed up, but it's a little more laidback. This timeless pick has contrast notch lapels and a slim silhouette. Bonus: It's made with recycled fabric.

Suitsupply Burgundy Tailored Fit Havana Suit

Photo: SuitSupply

Want to switch things up without getting too colorful? Try this burgundy option from Suitsupply, which boasts a classic tailored fit and beautiful Italian fabric. Best of all? It's completely customizable, from the lapel style to the buttons.

Indochino Hemsworth Black Suit

Photo: Indochino

When in doubt, a black suit will always be a safe bet for a formal wedding. This one is custom-made to your measurements with high-quality, comfortable wool fabric built for long days (and lots of time on the dance floor).

Suitsupply Tailored Fit Havana Dinner Jacket

Photo: Suitsupply

If you already have a pair of black suit pants you love, try pairing it with a fun dinner jacket like this velvet pick. Available in nine colors, it's perfect for fall and winter formal weddings where you want to look effortlessly stylish.

Abercrombie & Fitch The A&F Collins Linen-Blend Suit

Photo: Abercrombie & Fitch

Need something lightweight for a warm-weather wedding? Reach for a suit made with breezy fabric, like this linen blend option from Abercrombie & Fitch. The dark shade makes it ideal for a formal affair, and the double-breasted jacket is a fun touch. Plus, you can't beat the price point.

Additional reporting by Kate Boswell and Lauren Whalley.