Julie, Rute, or anyone else who has ordered Heattech items...I'm thinking about ordering a couple of tops and would love suggestions about sizing. I'm a U.S. size 8 or 10 on top depending on how things run. I'm large busted. I generally wear a medium unless items run small. Since these are made to fit close, would I be better off sizing up to a large? I don't want the fit to be super tight. I like a little wiggle room.