HELP! Texture and mesh clipping.

Your UV islands of the jacket and nude top are overlapping incorrectly.

You should see your UV map on the left side of the Blender screen. You may need to highlight some vertices/faces to see it.

Yeah so you can see the middle part does not line up with the sides.

One thing though before you start trying to align them, I've never made a garment accessory, but I don't think you actually need the nude body underneath your jacket at all since it'll be an accessory.

i would move each texture side of the jacket (front right and left). In photoshop, select the right front part, resize it horizontally and move it more to the right. Do the same with the left part and move it to the left. Then you'll need to do the same with the UV so that the jacket and the skin don't overlap. It's not that much that you have to move, so maybe the texture quality isn't going to be comprised that much. You can select UV parts by holding L while hovering each side of the jacket on the UV's screen.

edit: I'm assuming you know this but i'll just say it in case you didn't. j is right, you don't need the skin part nor the hands.  But what i've written above still applies if the texture is going to be left where it is now. Then you'll need to merge all the groups into one, clone an acc, append the merged groups and follow all the steps explained herelink. You don't need to edit weight, uv_1 or vertex  paint since all those things are already present on base game items.