Chosen Solution
I have two Patagonia items (Nano Puff jacket and a Nano Puff vest) that both have frayed collars, probably from rubbing against beard stubble. The nylon material has worn through exposing the fill material in the collar. The rest of the garments are in great shape, so I’d like to fix. Any suggestions?
You could get the same color and type material and make a patch the size of the entire collar and sew or have it sewn in, right over the old inner collar.