I'm not exactly sure what the difference is between chambray and denim. Would either of these two textures work ? I can put a larger version up for download of one or both if they'd be useful for making a shirt or jacket. (Same restriction - just don't sell the texture itself as part of a texture collection, otherwise have at.)
For jeans jackets, you can take the denim texture at my link a few posts up and just darken it.
Thanks,
NN