About 1954 Bermuda/walking shorts came to the USA. At that time knee socks were the rule. Since then bare foot, sandals, sneakers, laofers, anything goes. Comfort is the only rule. A kilt in hot weather is cool! In both meanings of the word. You don't need a belt to keep a properly fitting kilt in place but you do need some place to keep your ID and some cash. Any sort of a pouch should do. Forget the "look". Dress for your own personal comfort.