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, jumpsuits, 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 a black-tie nuptial," says Alex Rivera, a stylist at Stitch Fix, a personal styling service. Formal wedding attire (synonymous with 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.

FEATURED VIDEO FROM THE KNOT

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 example, 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. In summary, 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 a fun color or 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, a "colorful shoe, patterned tie, statement piece of jewelry or a fun pair of sunglasses (if the wedding is outdoors)" are all ways to add personality to your ensemble, according to Hurwitz.

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," continues Rivera. 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 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 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 "It girl." The best part? Many of the dresses are available in petite and extended sizes, too.

Anthropologie: Anthropologie has become a go-to for formal wedding attire, offering a dedicated "Weddings" section on its site. While you'll find styles fit for any dress code, the retailer has an impressive selection of formal options. Prices range from $78 to $798, and you'll find sizes up to 26W.

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 36 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 700 fine Italian fabrics, crafted and delivered within two to three weeks of placing your order. Prices start at $499 and increase depending on customizations.

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. We're also big fans of suits and other dressy separates. Check out our favorite styles, below.

Lulus Melora Black Sleeveless Maxi Dress

Photos: 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 Melba Maxi Dress

Photo: Petal & Pup

One of the best things about a formal dress code is that you have lots of freedom when it comes to color—no need to stick to darker shades. We love this vibrant berry pick from Petal & Pup, which has a pretty rosette detail at its halter neckline and a flowing, trapeze silhouette that will stun when you twirl on the dance floor. Use code PETALXKNOT for 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.

Adrianna Papell Foiled Mermaid Gown With Halter Neckline

Photo: Adrianna Papell

This formal wedding guest dress has an eye-catching crossover halter neckline, a subtle mermaid silhouette and stunning foiled fabric. It's available in four colors and comes in sizes 0 to 20, and just wait until you see the back—it has cascading cape tails that were practically made for making an entrance. Use code THEKNOT25 for $25 off any purchase of $100.

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.

BHLDN Everly Strapless Crepe Gown

Photo: Nuuly

This black gown from BHLDN is simple yet sophisticated. With its graceful A-line silhouette and strapless neckline, it's a classic choice for a formal wedding.

Endless Rose Tuxedo Velvet Jumpsuit

Photo: Rent the Runway

Looking for a jumpsuit worthy of a formal affair? Consider it found. This beauty is made with pretty velvet fabric and a tuxedo-like satin collar that's guaranteed to turn heads. Bonus: It has pockets.

ELOQUII Off 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.

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 and 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 fit options and four different pant fit 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 of any season. 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

For men's formal wedding attire, you can't go wrong with 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

Olive green is one of our favorite alternative color options for formal attire. This dapper suit from SuitShop is crafted with textured wool and a classic notch lapel, and it will 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.

Indochino Hartley Cotton Stretch 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 stretch fabric built for long days (and lots of time on the dance floor).

Suitsupply Burgundy Tailored Fit Havana Suit

Photo: SuitSupply

Want to switch things up without getting too crazy? 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.

Jos. A. Bank Tailored Fit Comfort Stretch Velvet Dinner Jacket

Photo: Jos. A. Bank

If you already have a pair of black suit pants you love, try pairing it with a fun dinner jacket like this velvet pick. Perfect for fall and winter formal weddings, this piece makes a statement without going overboard.

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 Lauren Whalley.