Ah, the Underwear Maven can tell all about the regenerated cellulose. Yes, once only known as the step child RAYON which is regenerated cellulose from wood pulp, now many more cellulose fibers like Bamboo, Corn and Soy. And Modal and others have made regenerated wood pulp soooo soft. Cotton of course is the big but old stand by cellulose fiber. Stripping it by mercerization can also give you a very smooth yarn- but it does make it a bit weaker... OK, so more than you wanted to know!
smile Lea
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UnderWearMaven