he has a section here at insim (warlokk's tower) and one at
http://www.Modthesims2.com (try member search)
the body meshes are the mehes for the clothes (or "showerproof skintones" - which means that the bodyshape works even when the sim is naked/in the shower. these have nothing to do with the clothing, they only share the bodyshape itself.)
to use the body meshes, just download the clothing with the right meshes. they work just like other clothing.