I Wear Tighty Whities

I was at karate last night and the workout made me sweat so bad my pants were quite wet. The problem with our pants is that even when dry you can tell if you look close enough what underwear people are wearing, but my sweat made them even more see through and it became obvious that I was wearing tighty whities. I was the only one and a number of people gave me grins like they were teasing me for it.