Both animations and body measurements... not with currently used graphics framework, as far as I know...
There MIGHT BE a creative solution which might help with implementing all that cheese without having to draw ten times more sprites for each wearable in the game.
If (big IF!) something like that would gonna be implemented, with current textures handling it might hit game's performance startight into its bells.
In other words... everything's terrible... that's a job for graphics framework built with exactly these goals in mind, unfortunately.
> -does any skill make my character fly to avoid atack in some move
Sprint (available for anyone not slowed down too much) helps with usual attacks.
Vault passive lets you Sprint through some things through which you can't otherwise.
There's Spellsword class mod available outside of Discord, which is decently balanced AND allows doing somewhat like that, but with projectiles, as well.