no, doubling the fabric will not fix the issues you mention. Garments that do that are very carefully engineered with diagonal cuts and lots of tension. Simply putting two layers cut the same way will not do anything but make you sweat more. In order to smooth the bumps you must wear a completely separate undergarment(s) to do that.
EDIT: A lot of people don't know how to buy these kinds of undergarments. you really need to try them on, and some are hard to get into. Basically if it pushes your lumps out to some other spot, it's too tight. No amount of spandex will magically make you look smaller, but smoother is always flattering.
Last edited by Penlowe : 05-02-2016 at 07:50 AM.