First off, looks like you're on an older version - definitely upgrade to Preview 4 if you can.
1. Draggables - can you try manually deleting the yellow circles that show up when your body is selected (collar, pulsera, ropa)? I think that might help, but not 100% sure.
2. I think the hand is so close to the hip that it's considering it one connected mesh, which is why the yellow triangles are showing up in the gap between the arm and the body. You could either a) raise the Mesh Expansion # below to see if that helps, or b) move the arm a little further away from the hip.
Ok, I upgrade to Preview 4, it's nicer lol
I move the arm further and it helped, raising the Mesh Expansion # didn't help at all, anyway, I removed everything you said and it still doesn't work
Thanks again, I'm the guy that ask you on Twitter about the mesh.
Oh hey. Can you post here or DM me a link to your PSD file so I can take a closer look? (Put it on Google Drive / Dropbox / Creative Cloud / etc)