What would you do if it were your wedding?

My fiance's brother is a groomsman & he serves in the army- which I think is great. We're all proud of him. Should I have him wear his dress blues or just a tux like the other guys? Would would you do? On the one hand, I don't mind b/c I think it's cool, but then on the other hand, I don't know if it'll stand out too much or take away from me, the bride- who is supposed to be the one to get the attention on the wedding day? What would you do?