Thought I'd pass this along. A while back I posted that I needed to have a new pair of Arcterex shells shortened was worried about keeping the waterproofness. The local tailors were no help at all. A call to Arcterex yielded the name of a facility in Seattle, (Rainypass Repairs; http://rainypass.com/), that deals with GoreTex and is apparently an authouized repair facility. They do not sell ski clothing, just alterations and repairs.
So, I bought my new pants and sent them out to Seattle. Got 'em back promplty and the results are GREAT! Extermely high quality work. I'm very pleased.