First of all, welcome to the forum and hello from Savannah, GA.

Few parts of Georgia gets hotter or stickier than Savannah, but I've worn wool kilt hose fairly regularly during the summer. I'm fairly traditional and I'm not a fan of the scrunched down look, so I've worn the hose in the usual way and really haven't had a problem. As you said, wool does "wick" moisture far better than cotton and I find it to be a pretty magic material... warm in winter, cool in summer. Not everyone who lives in hot climes shares this view, so it does come down to personal tolerances. You might want to ask your friend how much he has worn his kilt in the summer and how well he tolerated it.

I thought I might find my strome 8 yd kilts too warm in the summer, but I have to say, aside from a little bit of extra warmth around the middle, I find them to be well within comfort tolerances at any time here, what with their "ventilation factor."