You have to infiltrate the Gerudo Secret Club. To enter, go to Gerudo Town at the location indicated in the image below. When you enter, you will be asked for the password: enter GSC◆ and then enter the secret database. Inside, two sets for sale, including the one we are interested in in this article. Cost of the complete set: 2400 rubies and 9 luminous stones.
Written by Bastien "Lloyd" Dubosq-Luyer. Translated from French by Millenium.us.org.