I don't know if this is a common problem, but when I visit the outfit tab in someone's shop, it does not show me the outfits they are selling. I found this out because I am considering an outfit and memorized the seller's username to more conveniently find it later. When I finally went looking, the outfit was not shown in her shop, but when I manually searched through the outfit marketplace, it was still available.
On a second note, it would be really great if the shop log included outfits or if there was a special log just for outfits.