Properly made worsted wool actually breathes REAL well. I LOVE my kilts being 16 (and want to try heavier). Of course, I also love box-pleats, so it makes a MAJOR difference compared to a 8 yard tank.

Here is an example of the difference:
I have NO problem driving 4+ hours in a 4 yard box pleat. However, the 5 yard knife got on my nerves in a couple hours.
When in Aiken (South Carolina), I was talking in a clan tent anout kilts and the guys in 6 to 8 yarders talked about how hard to sit on the kilt if it was even for an hour. They were surprised I drove the 1.5-2 hours there with out issues. They would have taken off their kilts and put on shorts for that time.

Here is my Carolina DIRECTLY after 3 hours:
(From my home, through Greenville, and just north of Highlands, NC on my way to the Tartan Museum on Tartan Day)

Comfee on a cold (and windy) April day and on the HOT Greenville games (see posts on THAT one-> some think the field hit 100+).
If it works in South Carolina, it should work in Texas.