I am wondering if anyone can recommend tank tops or shirts that go under your main shirt that smooth things out? I don't want a body or anything, just a tank top that is designed to suck/hold everything in to give a flatter more appealing appearance! Do such things exist?

Yep!

Cami Shapers. Google that for options on where to buy, colors and etc.

Spanx even sells one on their website. They are a normal thing. Might even find them at Walmart Happy hunting!!

I really like Spanx camis, but they're kinda pricey. Here's the quick look at all of them -
http://www.spanx.com/family/index.js...goryId=3015048

My cheaper fave is called Teez-her. They look like cotton tanks, but are all business on the inside. They even have pretty lace and sequined ones. I got them for about $20 at Boscov's.

Found it online - plain -
http://www.boscovs.com/StoreFrontWeb...26&pdn=1010000

fancy -
http://www.boscovs.com/StoreFrontWeb...26&pdn=1010000