What I find pretty amazing is how you stretched and squished the skin around on those waist-packs to fit the stretching of the uv-map.
I have never seen anyone do this. You should uv your faces so they are even in pixel density and as un-stretched as possible, wich in this case would mean to have some seams at least (wich occur on the object in reality anyways, so no biggie for skinning). The way you did it makes no sense, only makes skinning harder - also, you are distributing the most space to the least visible faces (on the back of these packs).
I have never seen anyone do this. You should uv your faces so they are even in pixel density and as un-stretched as possible, wich in this case would mean to have some seams at least (wich occur on the object in reality anyways, so no biggie for skinning). The way you did it makes no sense, only makes skinning harder - also, you are distributing the most space to the least visible faces (on the back of these packs).