I am very slim too, Hez. What I do is wear one of those cheesy Halloween muscle shirts under my Predator skin, and it fills out the space between me and the latex suit skin. For the legs, I do what Kithunter recommended to me years ago and wear some BDU shorts with both cargo pockets and front pockets filled with the fiberfil pillow stuffing. Then I have a piece of sheet foam cut to place right across the front of my thigh under the latex, so the latex doesn't wrinkle and creates more of a flat look. Essentially placing the foam sheet in front of my leg pushes my real legs to the rear inside the latex skin so they're actually sitting along the backside of the latex Predator leg.