I really liked this resouce! So much so I decided I would make a catalog for it! You don’t need to check this out I just thought it would be cool. To add more skins open the local script and add the id to the skins table, the index is the name and the value is the id.
Link: https://www.roblox.com/games/3521750078/MC-Skin-Tester
(If you would like you can ask me to take down the game or if somehow you like the catalog you can add it to your testing game and I can take down mine, basically if you want me to do anything just tell me.)