I hope not!
I still haven't got a clue of what fabric is used in my wonderful pair of WH 1004xx. There are no codes on tags. it's fairly light weight.
here's a close up, what you guys think? I only know it is from the very first batch of warehouse 1004xx.
that's the only pair of jeans I've encountered so far that I like as much as my tcb 50s. bought for a song 2nd hand (but virtually new) on yahoo.jp. Yahoo is a great resource for 2nd hand warehouse stuff, loads of it floating around at cheap prices.