I was wearing a sweat suit and doing a roll... *rip* goes the seams down the crotch of the pants.
Luckily Sensei had a clean pair of white dogi pants he let me use.
more recent, my dogi pants started to split while in seiza. (Sounded like a fart was ripped. The kids at the end giggled.)
Looked later and all seemed well - but the seams were loose...next time in seiza - big rip, and I was quick to explain it was indeed the pants and not some rogue fart let loose upon everyone.
Dont know why I have such an issue with pants now that I think about it.