I ordered this bathing suit in a 2XL, I got it because I have one just like it in a different pattern in a size xl & I really like the fit. My previous one is slightly snug in the chest & butt so I decided to get one in a larger size. I am normally a size medium to large in tops & a size 6 in jeans. Im 54, 165lbs & a 36DD. After trying this bathing suit on not only was it hard to get on, it fit exactly like the xl (I was hoping since it was a bigger size it would be a little looser and larger in the chest). There seems to be no variation in size. I suppose you should go up a few sizes.