Lastex

Lastex is a type of elastic yarn that was introduced in the 1930s and was primarily used for swimwear, brassieres, girdles and corselettes. It consists of a rubber core surrounded by wool, rayon, silk or cotton threads.{{Cite book|url=https://books.google.com/books?id=BSs4Kd5tHsIC&q=lastex&pg=PA81|title=The Swimsuit: Fashion from Poolside to Catwalk|last=Schmidt|first=Christine|publisher=A&C Black|year=2013|isbn=9780857851246|location=|pages=81}} It was invented and distributed by the Adamson Brothers, a company owned by the US Rubber Company. It entered the market in 1931.{{Cite book|url=https://books.google.com/books?id=MtRbdACUkqgC&q=lastex&pg=PA63|title=Uplift: The Bra in America|last1=Farrell-Beck|first1=Jane|last2=Gau|first2=Colleen|publisher=University of Pennsylvania Press|year=2002|isbn=0812218353|location=|pages=62–63|language=en}}