I am petite xsmall, and of course, ordered a small, since there is no Petite xsmall for this product. It fits well and is much more shaped than the Hanes.  However, I haven't washed it yet!  Fabric is heavy enough to be moderately warm (in Southern California winter).
Neckline a little on the scratchy side, but the scoop is low enough that I don't notice when wearing it.