If a person wears slippers to a Western restaurant, as a waiter, he should behave appropriately according to the rules and regulations of the Western restaurant:

If the Western restaurant expressly stipulates that you cannot wear slippers and vests, Then the waiter has no reason to take the guest out of the Western restaurant. If the Western restaurant stipulates that this duty is within the scope of the waiter, he must perform his duty or remind the guest in a tactful way.

Western restaurant clothing etiquette: The most important thing for boys is to dress neatly and steadily; girls should wear dresses or suits and shoes with heels. Girls’ makeup should be based on the restaurant’s rules. Depends on the light. Since the light in Western restaurants is generally dark, if it is stated that formal attire is required, men must wear a bow tie or tie. When entering the restaurant, men should open the door first and ask women to enter. Women should be asked to walk in front. When taking a seat and ordering wine, you should ask the lady to taste and decide. When attending Western-style dinner events, you should of course choose evening makeup.