What do you think about Muslim girls who wear the burqa or hijab?!?

I think their hair is very difficult to manage and they don't have the time to straighten it every day. I have a Lebanese friend and she gets her hair straightened at the salon once a month, and on top of that, she has to straighten it every day with the dryer for 45 minutes. I don't think it's for reasons of modesty, because otherwise most of them wear very tight and revealing clothes.