My sister's wedding is approaching and I'm a groomsman. My question is, is it ok to change out of my tux into a suit of my choice after the ceremony and picture taking w/ the bridal party has concluded? I'd rather spend the evening in my own suit rather than the inevitable men's wearhouse tux I'll be rockin' at the ceremony. Since I'm a groomsman by default (brother of bride), I feel like it might be ok as opposed to a situation where I'm one of a band of friends who does this. Obviously, I don't want to go against proper wedding etiquette. My sister is ok with it, but she's not the type to say no to something like this. Thoughts?