She worked with innovative fabrics such as Lastex, an elasticized material that permitted form-fitting bodices, and styled and marketed high-fashion women’s blouses, jackets and skirts as well as play clothes.    From Wordnik.com.  [Claire Bodner.] Reference

It wasn't until the 1930s that wool began to make way for better-suited materials like Lastex - an elasticized yarn used for swimsuits that was a forerunner lycra.    From Wordnik.com.  [Gizmag Emerging Technology Magazine] Reference