In my custom, or in Islam, the polite one is performing ourselves in front of public by wearing the clothes which cover the whole body -- from the head to the ankle and having long hair (for girls / women), and cover the whole body to (at least) the calves for boys / men.
there is no such thing in my eyes. how you dress shouldn't be considered polite , it's only clothing. covering your whole body is kind of strange as the human body has no need to be completely clothed. are people afraid of letting others see what they look like in your country?