I couldn’t find a “save character” or “save outfit” model in the Toolbox that worked, so with the aid of @N3KOM4NC3R1, we created one
The way it works is simple: On a blank slate, the player has the option to Save, Wear, and Clear their currently equipped outfit. Saving the outfit will apply their current outfit to the mannequin. Wearing the outfit will, well, make the player wear it. Clearing the outfit will make the mannequin be restored to its Default clothing configuration
This model only works on R6 avatars. It will save accessories, such as Hats, Hair, Back, Front, etc, and it will also save if the player is wearing the Roblox girl torso. But it will not save 3D clothing, animated faces, and anything newer than R6.
It’s also important to mention that this model does not utilise DataStores. This means that saved outfits will be erased when the server ends
You can get the model for free here