1. Wash the shirt and dry it thoroughly for later use;

2. Dissolve raw starch in a basin with cold water. Each shirt collar needs about 5 to10g of starch and150ml of water.

3. Fully stir the raw starch in a dissolving well, immerse the shirt collar in starch water, repeatedly squeeze it dry and spread it out, so that the collar can fully absorb the starch in the water;

4. Dry the collar by hand, put it flat on the ironing table and iron it immediately. Pay attention to the high temperature of the iron and iron the front of the collar;

5. Fold the collar while it is hot, so that the two collars protrude outwards and are plump and symmetrical. Collar sizing can make the shirt collar stand up.