This is an insect egg, basically an egg called litchi stinkbug. Because the air is humid, wet clothes are very good places for insects to lay eggs, so eggs will appear on clothes. As shown below.

Here are some ways to prevent bugs from laying eggs on clothes:

(1) Hanging clothes that insects like to lay eggs indoors can avoid or replace other detergent brands.

(2) Add some salt when washing clothes, or add some 84 disinfectant (the main component is hypochlorous acid, which should be available in hospitals and pharmacies).

(3) It is suggested that the cabinet should be placed in a dry and ventilated place, and the clothes should be dried before being put into the cabinet, and at the same time, it can be avoided by putting insecticidal spices.