If there is no dress code, go with whatever outfit you feel comfortable wearing. However, if there is a dress code, check your invite or read up on any other details about the event so that you know whether formal attire is required or smart casual. If this isn’t specified, look at what previous attendees have worn and base your outfit choice around that. Formal, smart casual, semi-formal, cocktail dress, business formal, casual. Let’s take a closer look at what each generally requires. If it’s a formal event, you’ll need to dress up. This means a suit or dress for women. the colors and style of your outfit should be classic and elegant. You don’t want to wear something too trendy or flashy, as it may not be appropriate for the occasion.