Anyone chafe?

Fuck man, I have been chafing like a mother at work recently, like every day for three weeks straight now. I think its because of a uniform fabric switch which keeps me hot, but damn, it sucks. Anyone have any advice? I already wear underarmour boxer briefs (which have been tried and true for ages), my body has not changed at all recently, and I use baby powder liberally if it starts. The baby powder works for a while, but honestly, it doesn't come close to solving the problem. I am at my wits end.