At the very least, you'd need to put a lycra suit over the mannequin first, then latex over that. You also need to make sure that the mannequin is exactly your dimensions everywhere or larger than you everywhere, as latex shrinks right down to whatever you're applying it to. Unless you're a small adult or a younger person with a smaller frame, it's probably going to be too small, as most mannequins are not made to the dims of an average person. If it's smaller than you anywhere, i.e., knee joins, elbow joints, waistline, etc..., you'll never get into the suit and you'll have wasted your latex.