Personally I used a pair of under layer pants (long johns) with both Eva and upholstery foam adhered to it, and a spandex shirt with details down into it, which I made from scratch. My long johns use elastic suspenders to stay nice and snug, as they support the weight of my thigh armor. I own a morph suit as well, and I don't feel it would support the weight of my armor parts, though it could very easily be modified for that purpose.