I found one of the few responses that I've received from a US based Outdoor Apparel Company...
"We tried having our gear made in the USA. Since Clinton signed NAFTA, it drove all of the technical fabric manufacturing out of business in the US. You can still find cotton made in the US, but all of the fabrics that are used in the outdoor industry are made in Asia. From the start, we always wanted to have our line made in the USA. After searching ourselves, we finally resigned to the fact we were going to have to have our fabric made overseas, but we still wanted to have the garments made here. We imported all of our fabric over to the US to have it made here. We lost 2 years trying to find a facility that could get the cut and sew done for us here in the US. We finally gave up and shipped all of the fabric back overseas. It was really discouraging that we couldn't find a place that could do the technical sewing at a half-way reasonable cost, but that industry was gutted when NAFTA was enacted. We are continuing to look at other options for having the cut and sew work done. But the sad reality is, at minimum the fabrics are going to be imported for the foreseeable future. That is how it is for all of the products within the outdoor and hunting world."