Errors in the cc I'm trying to do.

Hi. Sorry for the wait, had no access to pc.

1).The normals of the collar are facing the wrong direction.
- select them first by selecting a face on each, then Ctrl L to select the whole thing;
- Mesh - Faces - Solidify, set Thickness to 0,002;
- you could also delete the side geometry where it is not visible

2). Transfer uv_1 and weights with Nearest face interpolated, otherwise the mesh will move and morph like crumpled paper.



3). Your reference was shorter than the garment, so it might clip into bottoms at the bottom.

There are other things that you do not need to fix but should avoid in the future;
- in md model in quads and keep Particle distance high or retopologize the mesh. Right now it is shaded like cramped paper because of topology;
- either use custom buttons or retopologize MD's one, they are too high poly;
- try to avoid overlapping geometry ( the piece of mesh behind the buttons ). When you removed doubles, it ripped the uvs;
- delete more of the body. If its not visible, it is not needed;
- you can make the uvs of buttons bigger so that their quality is better. Meanwhile the uvs of the geometries that cover holes do not need to be that big, they are barely visible;
- when closing holes, collapse them instead of just scaling down. You also scaled them down the wrong way thus creating extra edge loops;