Clan cheifs and Scotty Thompson notwithstanding, to me it seems a little unnatural to tuck my vest into my kilt. I would never tuck my vest into my pants, so why would I with the kilt?

I don't wear a belt with the vest because the vest would either fully or partially cover the belt. With no belt, there is a nice clean line from the vest to the kilt that looks very nice and neat.

Sometimes if I am wearing an open vest, I will wear a belt, but never with the vest closed.

Oh, and as for summer weddings, personally I'd wear a long sleeved shirt and then roll them up if I get warm. Long sleeves are a bit dressier than short sleeves. Someone told me once that anytime he saw a grown man in a short sleeved white shirt with a tie it made him think of Homer Simpson, and I've never worn them since! :-)

M