Most yarns are plain - simply plies twisted together but there are other yarns called novelty or specialist yarns. Chenille has a core of strong plies spun together to trap the short velvet pile threads.
Boucle has two plies spun together at different speeds so one bunches up around the other creating a towelling look when knitted up. Slub yarns alternate between thick and thin creating a very textured fabric. Ribbon yarns are exactly what they sound like; knitted up they form a loose fabric with plenty of drape. Mohair or angora yarns have been brushed to raise the hairs of the fibre and make a soft fluffy fabric. Fun fur yarns with short or long piles knit up for an extra furry garment. Fleece yarns knit up to make a soft all-over pile.
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