teoanneI've owned some Slim Fit Icebreaker tops before, and I'd say going a size up at least for me was good. Plus then if there's any sort of wash shrinkage it won't be a big problem. My measurements are 38-29-39 at 5'2'', average torso length, and i went for a Large. It's a little roomy now that I've worn them a lot but still fits nicely. I've had other women note that the Slim Fit is a little smaller than their normal sizing, so they buy a little larger to be more comfortable.