Semi-formal. This laid back style has an indescribable mix of nuances with inspiration in organic elements, minimalism, rustic style, effortlessly cool, 70s, vintage, even a tad of Victorian romanticism thrown in. This dress code emphasizes the balance between comfort and style. You can still wear a jacket but without a tie. If you prefer not to have layers, then sticking to just a long-sleeved shirt is also appropriate.