The secret shop in Gerudo is located behind the clothing store. If you go through the alley to the side of the building you will find a door which will ask for a password to gain entrance. The password can be heard from a couple of women talking in the bar. The password is GSC (diamond symbol). The secret shop will have two outfits called the Radiant Outfit, which can be bought only by Luminous Stones and the Desert Voe Set that offers heat resistance.