What Is Formal Wedding Attire? Here's What to Wear - The Knot 28. helmik. 2019 · So, you received an invitation to a wedding and it requires "formal wedding attire." While this is one of the most popular wedding attires 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've tapped experts to break …