Shirt won't attach to body

I bought a shirt and for some reason the shirt won’t slide in the body, it wants to go around it. Not sure what the problem is.

Me nether… you want to move the vertices of the shirt-model more to the body?

Yes, i believe so. Whatever will make the shirt push inside the avatar so I can fit the shirt around it.

So you are a newbie (you should tell… it’s part of you problem)? (Looking at you profile :face_with_monocle:… ahh yes and we met already…)
I’m also not quit sure what:

means.
In Edit Mode Tab (or top left) you can directly push the vertices (1, edges 2, faces 3) arround with the Tweak Tool or even use the Sculpt Mode (also easy to switch to with Sculpting Workspace or top left) …

You also can make screenshots directly in blender: Window → Save Screenshot

Hi, you can also check that snap to faces or vertices is not activated or modifiers are active in the stack.
see screenshot: