Hello, I have a question about attire for the guys. The groom and the groomsmen are wearing a very dark grey suit with vest. We also have three ushers. Do they have to wear the same thing? My mother in law thinks they need to, but I like to do things different anyways. I was thinking the ushers could wear the same dark grey colored pants and vest and a white dress shirt. So basically the same thing, but no jacket. What are your thoughts?