I think you are referring to Thabita model by Michael2, a beatiful piece of work. You can try to use magnets on the chest and hip area of the clothes hiding model's body parts, although you want close-fitting effects; in this case, if you're enough skilled with magnets you can do the job (with very very much work), but if not you can try to paint clothes on in a 2d program such as Photoshop or Paint Shop Pro. The no-fitting-wear is the greatest problem on custom models, but I've seen some stunning works from many artists here.