I've read that anything knitted with 100% cotton yarn will stretch significantly when worn. I've knitted with cotton before, but it was years ago and I can't remember if they were cotton blends or not. Is it true that pure cotton yarns stretch, and if so, can anyone recommend a cotton yarn that won't?
Cotton is heavier and it doesnt tend to have as much elasticity as wool or other animal fibers. It will usually return to original form with washing. If you want something that wont stretch out, try a blend like GGH's Bali or Goa.