That's because Lycra, a stretchy fiber most famous for putting the spring into nylon exercisewear, swimwear, and foundation garments, is turning up blended in tiny amounts with natural fibers, such as wool, linen, cotton, and silk, not to mention paired with rayon and polyester microfiber.
Lycra's expansion into the fashion-fabric arena includes both knits and wovens, so these days you're just as likely to see a woven wool suiting blended with 1% Lycra fiber as you are a wool or silk jersey given more resilience by 3 to 5% Lycra.
Topstitching on Lycra knits is done with a ZWI HS stretch twin-needle, using woolly nylon hand-wrapped onto the bobbin and in the loopers.
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