I have a light gore-tex jacket. The pocket zip has detached from shell. The jacket is not ripped. Does anyone know how to "repair" it? Are there agencies in US who can do it for me?
I have found that many drycleaning/laundry agencies (where you drop off your clothes and pick them up later, not laundromats) will do small repairs/alterations.
Sew it back on and tape the seam.
Stitching GoreTEX is the same as stitching any other material, the difference is you want to use Tenara thread, and you waterproof the seams on the inside of the garment after by ironing on GoreTEX seam tape. You can get any seamstress to repair your zipper, they'll probably tape your seam for you as well. If you want to do it yourself, you can purchase seam tape from multiple sites online including ebay and amazon.