A colleague at work has recently been looking into outdoor clothing companies that make products in the North America vs. almost everyone else that makes then in China.
Here's a list of his favorites – and some new ones to me:
http://www.wildthingsgear.com
http://www.featheredfriends.com
http://www.nunatakusa.com
http://www.integraldesigns.com
http://westernmountaineering.com