softgoods books?

Has anyone come across any softgoods books? Or product design books with decent sections on sewn products? i’m particularly interested in bags/backpacks but shoes and gear would be cool as well. There are so many fashion books that I seem to get lost in the search and end up looking at high fashion purses.

good topic, i’ve been looking for some footwear books for awhile now. something really technical would be great, most of the stuff ive seen is condensed ‘history of footwear’ stuff. some of the people on this forum talk about studying footwear and design courses, so maybe amazon or some website will sell the textbooks they use…

→ Mainly performance footwear, don’t know if it evolved…

Technical softgood books (covering performance ánd fashion) seem hard to find.
Aren’t there sites similar to http://podiatry.curtin.edu.au/shoo.html and http://www.shoeinfonet.com/ ?