NWT Free People Keyhole Sweetheart Bust Tank Top. An O-ring at the front takes center stage on this sleeveless, fitted T-shirt from Free People. Sweetheart neckline with O-ring detail. If you love the laid-back charm of boho-chic apparel, you'll find a beautiful selection of clothing from Free People at Macy's that fits your style. From ultra-feminine dresses to cute, flirty tops, you will love this piece. solid color makes it easy to layer and match. material is viscose/spandex. very stretchy!