where can i find HIGH QUALITY black martial art pants?

long story short, Century use to make these AMAZING 100% polyester pants. i need black for my uniform. they felt like silk on your legs, they were breathable, they didn’t ride up, they were just heaven to workout in. incredible! but i got them from my master, who had them in storage from years ago when he was my size. so they’re probably 30+ years old. what other sites can i scope out for mainly polyester based black pants?? or what do you recommend?? everything is cotton blend now. yuck!

i cant have anything flashy. it needs to be straight black. can’t be satin or silk based either. the polyester pants are so amazing i’m afraid im going to be chasing this high forever. i’ve scoped amazon and i found the same pair but in white. and as a black belt, that’s outside of dress code.

edit to add info: i am a first dan in taekwondo, my club requires white uniform top (with the black outline) and all black pants. they dont care specifically on pants, its the tops that we need to be the same with. so im on the hunt to upgrade my pants. taekwondo we do a LOT of kicking, so fabric that GLIDES! i have another pair of 100% cotton and they are awful. i am not a fan. the 100% poly is my backup and they feel like butter. but like i said, they are probably 30+ years old!:(