There’s nothing quite like the mini stomach flip that comes from seeing the words “formal attire” printed on an invitation. First comes the excitement of having an opportunity to get dressed up. Then, the panic of not knowing exactly what is acceptable to wear. After all, the lines can get a bit blurry, especially with all the subsects of formalwear that often get thrown around. To wit, there’s semi-formal, which is often conflated with cocktail dress codes, as well as beach formal, which is sometimes the rule for destination weddings. Aside from weddings or the occasional gala, however, there are many reasons why one would need formal attire in their…