These US cut and sew companies can help design, prototype and manufacture your designs.

Clothier Design Source

St Paul, MN.  Apparel design, soft good engineering, product development & manufacturing located in St. Paul, MN.
http://www.clothierdesignsource.com

Reuse & Baby Lou

Louisville, KY.  We offer small batch micro-manufacturing, supporting other small businesses with their soft goods needs.
www.reuseandbabylou.com