The purpose of the surgical gown is to isolate bacteria and sterility. Surgery is sterile in the front, so the design of the gown should be tied at the back. The clothes worn by surgical patients are the same as those worn by doctors, so it is the other way around.

Before the 20th century, doctors in Europe and America were all dressed as gentlemen. I wore a tall hat and a gray robe and walked past the early hospital.

At that time, the concepts of modern microbiology and disinfection had not been established, and doctors dressed for "protecting themselves"-avoiding the pollution of clothes by blood and dust hidden under robes. Gray robes can also make stains less obvious.

In medieval Europe, doctors also wore "bird's beak masks" and wore a gray or black robe from head to toe, which looked scary, but it was a historical testimony of human struggle against the plague.

Doctors wear white coats for only a hundred years and are regarded as a symbol of "cleanliness". There is a saying that joseph lister, a British surgeon, first popularized surgical disinfection. Since he began, white coats have gradually become popular.