question on slimming tank tops - kind of mom related

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Ok so i have a weird question. I know a tank top is not going to make me thin that is not what im wondering. Im curious if anyone who has had a baby and has used slimming tank tops if it helps with tightening up the skin/getting the belly a little smaller. I know if you wear compressive garments after a baby that some people do say this helps with the skin shrinking down. let me hear your thoughts