I put the original denim source texture (400x400, 132KB) and a shrunken version (200x200, 32KB) on my site. They are seamless tiles. Use as you want, commercial or free clothing textures, just don't sell the textures themselves.

http://www.digitalshire.com/freebies/stuff/denim-big.jpg
http://www.digitalshire.com/freebies/stuff/denim-sm.jpg

Enjoy!

NN