I own several of these tees and practically live in them.  I wear them under sweaters for work, with jeans at home, and even as PJ tops.  This tee is so very soft and moveable and I love the body-hugging fit.  Be aware that the V-neck is very deep and does show some cleavage.  I'm 5'7" and weigh about 125, the XS is a perfect fit.  This tee is long and appropriate for low-rise jeans, and the sleeves are very long as well.  I bought some of these tees over a year ago -- after weekly washings (I really do wear them all the time) the color has faded slightly, but not to the point of making the tee unfit to wear in public.  These tees are pricey, but worth every penny.

UPDATE:  As of 5/25/15 -- over three years after purchasing, some of the black tees are too worn to keep wearing, even under sweaters.  Please bear in mind that I really have worn and washed these tees every week.  I'm just now starting to replace them, and happy that Splendid still makes them!