Here is how to distinguish between wool sweater and ordinary sweater:
Look: see if it has different thicknesses, and see if the hair lines are uniform;
Touch: The woolen sweater feels better, smooth and soft. And ordinary sweaters may get tied up;
Recognition: There will be wool content on the sweater tag, and the content is high, but the content of ordinary sweaters is average;
Burn: You can pull off a little bit of hair and burn it. Smell for the smell of burnt feathers. The smell of high-quality woolen sweaters is relatively strong.