mesh is not clean

Hi. Your pics won't load. Please reupload them and share your blend + package

You need to vertex paint your meshes with 00FF00
You also need to transfer the uv_1 map with Nearest face interpolated

Also, about your shirt. It is extremely high-poly. You do not want to go past 10k polygons unless you absolutely have to, which is not the case here. Ideally you would want to retopologize it, but you will be able to greatly reduce the polycount by a). collapsing those border edges like i showed b). not using buttons from Marvelous designer or reducing their polycount c). modeling with quads in MD instead of tris


1). enable sync
2). switch to vertex select
3). holding Ctrl, lasso-select everything that is unnecessary;
4). in 3d view press Delete and choose faces
5). select everything but the outer edge loops
6). Select - select less/more - less
7). in 3d view press Alt M and choose collapse. Make sure to click uvs
8). to reduce polycount of buttons even further, select the inner loop and deselect every fourth vertex. Once done, press Alt M and collapse. Do the same for the outer edge loops
9). weld these vertices by Ctrl-selecting them and W - weld


Bigger uv islands = better quality. All major ones should be scaled uniformly (as in, at the same time). Uvs of those parts that are not visible can be scaled down significantly while uvs of buttons can be scaled up for extra quality. You can bake textures from one original button and use it for the lower-quality one