What were the usual table manners for princesses of Asia back in the day of the Great Wall of China?

There seem no detailed records, but the general ones include the following:
Once seated, no extend arms and legs; Only pick the food in front of her, without getting up for further food; When eating, no obvious chewing sound appears; Turing back if coughing; No leftover should be left.

Moreover, some people said that the princesses should cover their month when eating or drinking at table to avoid others seeing them having/feeding food.