Check out the "Gypsy Rose Lee" stuff (I think that's the name) -- clothing that was designed to be taken off, with a ton of morphs. Your hip problem sounds like you either moved some of the vertices or changed the vertice order. There are times that even perfectly aligned vertices won't weld in Poser due to some strangeness in their order (or some other peculiar problem existing only in Poser's wee little brain).