A person should act with modesty before our King, Hakodesh Baruch Hu. This behavior shows he is not a big shot, and that he fears Hashem. To act modestly, a person should dress modestly and not show body parts that were made to be covered. For example, the body should be covered from the neckline down, and arms should be covered from the elbows up. These halachos should be discussed with Rabbis and teachers.