A Mii's Closet is where clothing is stored, either purchased from the Shop, earned from Miitomo Drop stages, or any other method of obtaining clothing. From the Closet, you are able to change your Mii's outfit, and are able to set an Outfit.
Outfits[ | ]
Outfits are saved combinations of clothing. You're able to save your outfits by pressing the star button in the Closet.