[solved] Strange shadow from flipping normals

Hi. The mesh was duplicated more than once, so "frills" has overlapping geometry. Select "frills", select everything with A, Remove doubles with merge distance set to 0,0001. Do the same thing in uv_0 and uv_1 (W - Remove doubles);

I have no idea what is wrong with this package specifically, but when i import the blend in a different one, the shadows do not appear. It's not a texture and the blend is being imported, i checked. So just clone a bra again and try again (maybe a different bra).

About "holes", if you get them after removing doubles, you need to select everything and Mesh - Normals - Recalculate outside before adding the other side. The holes in question are just faces that are facing the wrong direction. If joined faces have mismatched normals, Recalculate outside will work.

Do you add the other side by duplicating the mesh and flipping normals, no offset? Use Solidify modifier with Fill Rim disabled and Thickness set to 0,0002 instead. Remove the doubles and recalculate normals before you'll do it

Also, it would be best to move the uvs of frills away from arms because some cc skin maker flood that area between arms with skin, so the transparency won't work