Why do hotels need to bring their own three blacks when recruiting part-time waiters?

This is the general rule of star hotels! Service personnel should wear uniforms and black is meaningful! Because waiters work hard, especially catering waiters. Dealing with food every day can easily stain uniforms and shoes and socks. So black is more resistant to dirt and is not easy to be seen. Of course, the uniform should be changed every day! If you wear white socks, it is easy to get dirty and unsightly for guests to see. This is also the international practice of the hotel industry.