which version are you using, and are you just getting the id from the avatar shop?
Well, for starters, use the texture for the shirt, not the shirt id.
If you don't want to go through the hassle of studio/looking through ids, upgrade to 1.3.
If you want to stick with 1.2 though, just open studio, make a place, insert a shirt, and paste the avatar shop id. it redirects to texture id, and you can paste it back into novetus.
