Single-breasted suits are divided into the following situations:

A button suit can be buttoned on formal occasions without buttons at ordinary times. In addition, it is worth mentioning that a button suit can be worn as a dress if the collar is changed;

The two buttons on the suit look very chic without buttons. It is not recommended to buckle the top one on formal occasions, which will look dull and rustic, and it is absolutely not allowed to buckle them all.

Three-button suit, usually without buttons, or with one button in the middle. For a particularly formal suit, you can also buckle the top and middle, but it is also forbidden to buckle all three.