Soy in clothing isn’t exactly new. Henry Ford first talked of it in the 1940s and was photographed wearing the first known soy suit and tie. Soy fibers largely disappeared though, until recent developments in China.
Now, soybean protein fiber is being marketed as a “vegetable cashmere” — a new eco-friendly luxury textile. Those who’ve tried it speak enthusiastically about soy’s soft feel, lustre, combined with washability and durability.
Soybean fiber also has the advantage of being a renewable natural resource and a by-product of food manufacturing. Some soy textiles have organic certification.
Soy costs approximately 30% more than organic cotton and hemp due to accessibility issues and the raw fiber material costs today. However it is higher end fabric, and many feel its softness and lustre are worth the extra cost.
An article about soy clothing can be found here.