Mods (aka addons) can't influence the game itself, they can only interact with the UI and then only in ways ZOS allows through their API, so there's no way to make new outfits or edit existing ones.
PC EU player | She/her/hers | PAWS (Positively Against Wrip-off Stuff) - Say No to Crown Crates!
"Remember in this game we call life that no one said it's fair"