Remove shirt decal that is part of mesh?

Hi.
- switch to Edit mode. In uv editor enable sync( highlighted blue button in the first image), hold Ctrl to select those specific uv islands;
- in 3D view press Delete, choose Faces;
- switch to Edge select, holding Alt, select the borders like in the second pic. It will select more edges than you need, so hold Shift to deselect unwanted ones;
- deselect those two edges at the beginning and at the end of 5;
- Edges - Bridge edge loops;
- now you just need to edit the textures

Try selecting them from on side to another instead of randomly

Yes, you’re meant to use alt shift to select more than once. And you’re meant to unselect unwanted ones by holding Shift (no alt)

Sorry for the wait, lost the thread.
Theres another way
- delete 5 as explained before;
- enable sync, press B, select the whole front of the shirt;
- remove doubles ( in 2.7x: Tools - Remove doubles, in 3.3 Mesh - Merge - By distance ) with Merge distance set to 0.0001;
- in 2.7x Select - Select boundary loops, ion 3.3 Select - Select loops - Select boundary loop;
- now in uv editor press B, holding Shift deselect all of them beside 5;
- then dont forget to deselect one at the beginning of 5 and another at the end, then bridge

The link does not work.

You need to edit all textures that have 5 on them. If you did and it’s still there, it’s possible the the blend file did not import. Do you have S4Studio cas/mesh tools in blender?