From Macy's
If you need a little bit of help keeping your shape in check, then this form-fitting v-neck T-shirt from Shape Form by 2(x)ist offers the no-show assistance you're after.
From Bloomingdale's
2(X)Ist Form-Shaping V-Neck Tee.Color:White.Size:Small.Material:80% cotton/20% spandex.Underwear.