If the original cloth is not easy to see, only after washing the water can we better distinguish the advantages and disadvantages of the fabric.
First look at the color, gloss, bright colors, smooth cloth, usually mercerized.
Look at the yarn and ingredients. Cotton is more expensive than polyester and cotton, but it's more expensive. Fine gauze is more expensive than gauze.
If it is elastic jean, it is more expensive than other companies, and the elasticity is more durable.
The end is whether it is fashionable or not. People who are very familiar with jeans are able to sweep out all the denim with their eyes, which is worth learning.