Back is Nylon & Lycra Spandex. From 1970s.
Calaméo - THE BEST OF INTIMA - February 2013
Vintage Bra Smooth Support Nylon Lycra Spandex White Adjustable 1970s NEW 40D
Aerostich 2019 Catalog by Aerostich - Issuu
Vtg nylon lycra spandex - Gem
1960s Long Line Bra White Cotton and Satin Pointed Conical
Vintage Bra Smooth Support Nylon Lycra Spandex White Adjustable 1970s NEW 34C
visual-search/test/sample-data-larger.txt at master · awslabs/visual-search · GitHub
Vintage 1970s white nylon - Gem
CLZOUD Comfortable Bras A Nylon,Spandex Women Back Button Shaping Cup Adjustable Shoulder Strap Large Size Underwire Bra 40