Warner’s 1009 Any-Which-Way convertible low back bra, beige, 34B-C. This bra has an interesting strap configuration that allows it to fit lower in the back than a normal bra. The straps from the sides go down and around the back, crossing each other, then continuing back around to the front where they clip together at the waist. The shoulder straps can either be clipped to the back strap or worn halter style. The underwire cups are seamless, quite stretchy, and sheer.
A search in 2010 found no references to this model, indicating it had been discontinued some time ago.