What's the name of the handkerchief in the jacket pocket?

That kind of cloth is called a suit handkerchief, or a suit handkerchief. The main function is decoration, beautiful, convenient and practical. Good news. The bird suit is good. I like the combination of Chinese and western clothing culture. Learn more about the origin of western decorations, wear a suit so as not to cut presbyopia, wear a formal suit without a tie, put a pen in your coat pocket and so on. Avoid embarrassment in social places.