The patented Figs Bra comes with detachable cami-covers (or "figlets") that attach to hooks on the side of the bra and stretch across the chest to cover cleavage. Don't need the coverage? Just take the cami-cover off and wear the bra without it. L-O-V-E T-H-I-S.
Need to completely hide your girls from sight? Say hello to the Carol Wior Soft Cup Lace Camisole Illusion Bra, the Guantanamo Bay of bramisoles. (Hey, this would be perfect for concealing microphones, hidden cameras, a semi-automatic pistol...)
This disturbing looking cleavage contraption is called The Winkee and slips over your bra like a pair of underwear (overwear?) to cover cleavage or give extra support. One question: WTF?!
If you want something that can still pass as a cami under clothes, but looks and feels more like a bra, the Natori Zen Floral Camisole Bra is where it's at. (And it's not as heavy on the lace, which is an added bonus if you're a man who likes to wear women's underwear. Kidding.)