I picked up the new seamless In the Flow Tank today and really like it. You wear your own bra under it. It's very soft and lightweight. My store was having a giant sale this morning so I just grabbed my larger tank size but it's a bit loose in the armpit/upper chest so I might go back and try the next size down before I take the tags off. However, I suspect that since I'm a bit of a pear shape it'll be too snug in the hips. For sizing, I think you should get your CRB size in this tank.
Side gather detail.
Compared to the same size CRB. However, the In the Flow is stretchy so you can pull it longer.
I also grabbed the black. Not sure whether I'll keep this one since the color is on the duller side. It also comes in Fatigue.