We are having an August afternoon wedding/reception. It'll be semi-casual and hot. We are trying to cut costs, so I thought, "Why rent a tux?" I told my fiance that he and his best man could just wear suits which they have. I think that will be fine. My sisters are going to be bridesmaids, and both live at a distance. I told them to just pick a black dress; something they have or something new, I don't care. I thought this would be easiest, not trying to match colors. But now that I'm thinking about it, will this be O.K?
Should I specify that the guys wear black suits, though I had been thinking tan slacks with blue coats? Will black dresses be too formal for an afternoon wedding that's a little on the casual side? Do you understand what I'm asking?