Sinclair Mills was a swimsuit manufacturer. Over the years, they contracted with several big name designers to produce lines of swimwear. In the early 60s, Tom Brigance worked for them. Donald Brooks produced designs for Sinclair in the late 1960s and early 70s, and Giorgio Sant'Angelo followed him starting in 1975.
This bikini with matching maxi skirt was designed by Donald Brooks for Sinclair in 1970. The halter top has very long strings that tie at the back of the neck and then wrap around and around, however you choose. The maxi skirt can be worn at the waist, the hips, or even over the shoulders when you've had enough sun. All in black nylon. Sold for $95 in 1970 (about $571 in today's dollar.)
Photo by Bergstrom for Vogue, 1970.
Model, Lynn Sutherland