Can anyone please explain this to me?

Okay, so some of you may remember me posting about a coworker of mine that won't stop talking about her wedding, and how I found that to be a little annoying. Well, today she was talking about how she was going to go dress shopping after work and said something like "after I get married, you guys are going to notice me dressing differently than I normally do. I'm going to be dressing more feminine, and my fiancé is going to be dressing more formally." I just said okay and moved on, but is this normal? She comes from a big family and I think that she may be religious, but it still seems like such a bizarre and arbitrary thing to do. Like, if anything, you'd think that you'd dress more casually around each other after your big day, but what the hell do I know?