Bikini culture in the 1970s wasn't quite what it is today. Legendary model Christie Brinkley just explained the whole thing on Instagram, also managing to wow the platform with a bikini throwback that dates back to 1977.
Christie, 65, updated her Instagram earlier today. Her photo showed a Cosmopolitan cover from back in the day. The "Sports Illustrated" legend was looking smoking hot in a super-tiny and high-waisted bikini in purple. The satin two-piece was showing a lot of hip, and Christie mentioned this in a caption that was long – but ultimately incredibly eye-opening.