Today, in a foreign etiquette class, the teacher said that you must wear a formal suit on formal occasions, even if it is very hot, you should wear a suit or something.

No. Now we say that wearing a formal suit is a suit. Of course, if you are patriotic, you can also choose Chinese tunic suit. Wearing a suit on a formal occasion is a respect for the guests, and of course it also represents your image and serious attitude towards things. And if you want to face important guests, you should buckle the above two buttons to show your solemnity. This etiquette is not affected by weather conditions ... don't get angry. ..