Im a heavy sweater too, and I know this isnt pants, but wearing one of those undershirts with ridges or other texture lets you sweat under your main shirt without it soaking through. And as that sweat wicks and evaporates, it might cool you so that whatever pants you're wearing wont feel as hot. Basically more surface area makes sweat/cooling more efficient. But yeah people are recommending dickies because they breathe. Not really in the way where materials let air pass through, but in the way where as you walk, air is pushed around inside so the hot air and everything is pushed out the bottom as cooler air is brought in. Wearing thin athletic underwear/leggings instead of other underwear works for some people too. I wear dockers with leggings underneath because I'm in the cooler a lot. Since the undershirt and leggings keep me from sweating too much while I'm out of the cooler, they still work as insulation.