This website has a lot of information on all area in fashion.

http://www.apparelsearch.com/

Also try

http://www.infomat.com/sourcing/index.html

This is the direct link into the contractor's section you can also click on one of the links to the left under the heading "sourcing".

For fabrics, I usually do a search on the specific fabric I need.

I'm just starting myself, so I know what you're going through.