What are the towels on the dining table of a star-rated hotel?

What are you talking about? If it is a small square towel, it is of course used to wipe your hands and sweat. If it is on a plate, put the flowers on your legs to prevent food from staining your clothes. Actually, you don't have to worry so much. No one will notice how you use it. As long as you have quality, don't get dirty.