Skin Capabilities is a mod that allows you to change your skin cape and elytra textures! You can edit your skin properties via the config or the in game command. This is possible through the EvilNotchLib SkinCache API which not only fixes skin but allows dynamic changing of them. You cannot change the skin of another player only for yourself.

Features:

/skin <username/url>
/skin set <skin, elytra, cape> <username/url>
/skin set <mouse_ears, dinnerbone> <true/false>
/skin get <entry, encode, skin, elytra, cape> <username>
/skin refresh <username>
/skin refresh
Mouse Ears apply deadmau5's mouse ears when true syncs with yourself and other users. You must have a texture with mouse ears that are not transparent or you won't see them
Dinnerbone / Grumm When true will flip the player and activate the easter egg without you needing to actually be dinnerbone or grumm

Using "@user" for cape or elytra will always be a live sync with that user instead of a static URL conversion
Using "$clear" for cape or elytra will ensure it dissapears regardless of what skin user your currently synced with

Examples:

/cape "https://skinmc.net/capes/15460/download"
/cape "jredfox"
/cape "@jredfox"
/cape ""
/cape "$clear"
/elytra "https://skinmc.net/capes/74898/download"
/elytra ""
/elytra "$clear"
/model slim
/model default
/model ""
/skin "https://www.minecraftskins.com/uploads/skins/2025/02/25/the-thing-23082967.png"
/skin https://minecraft.novaskin.me/download/1662573061
/skin ""

Using "" will sync the cape / elytra / model to whatever user you originally were synced to whether it be yourself or another user using "/skin username" without the quotes.

Compatibility:

Optifine
More Player Models
Mo' Bends
Tails Mod