Not really. Sure, wedding rules regarding what to wear are more relaxed than ever these days, so much so in fact that wearing black to a wedding is considered OK and that many brides don’t wear white.
However, to be on the safe side, and since white is still considered such a classic choice for the bride, it’s best to avoid wearing white to a wedding unless you are the bride.
The main concern is not just overshadowing the bride – it’s the possibility that someone is going to mistakenly assume that you are the bride. Many brides, especially if they are older or if it’s not their first marriage, choose a white pantsuit or a very simple white dress rather than an elaborate bridal gown.
This means that if you wear a white outfit, you could be mistaken by someone as the bride, which is probably one of the most awkward situations that can happen in a wedding!
To save yourself and the bride some major embarrassment, do consider wearing a color other than white to a wedding. Of course, you can still wear an outfit that has SOME white in it, such as the lovely dress (found at shopbop.com) pictured above.
Traditionally, black was not an option when it came to the wedding guests. Black used to be associated with mourning and so deemed as highly inappropriate for a joyous occasion such as a wedding. 
