How to Wear for the Black Tie Wedding As Guest
However, you should know what does the black tie mean at first. Calling an event "black tie" indicates that it is about as formal as you can get. This means that formal attire needs to be worn. Often, this is up to the couple whether they want their special day to be formal or not. Sometimes the venue chosen will dictate the terms. The next will learn what to dress for the black tie wedding.

How to dress for the black tie wedding?
For the women: Women have a little more creativity than men when it comes to dressing for a black tie wedding. You can wear a long evening gown, a short cocktail dress, or a dressy pantsuit suitable for a formal or semi-formal event. Men are restricted to a tuxedo or military dress uniform. However, women can choose any color or style as long as it is an evening gown, cocktail dress, or semi-formal pant suit. The one thing to watch out for is that you coordinate your colors with your date.
For the men: The men who attend a formal wedding absolutely need to either buy or rent a tuxedo. The tuxedo should be black or another dark color, such as navy blue. Ideally, the vest or cummerbund should also be black or another dark color. If you have a date, coordinate the colors with your date's gown.
Also acceptable is if you are in the military you can wear the formal version of your military uniform (called a "mess dress"). However, if you don't have this uniform sitting around, it isn't worth it to buy one. Don't wear the uniform unless you are active duty military. In other words, you need to be authorized to wear the uniform. Don't just borrow a friend's.