What description you gave about your dress might be modest in your native, not in Qatar. I can see now Qatar has changed a lot. I can see more women wearing short skirts and more revealing dresses. But things are going beyond. So better all who wear short skirts and lowhip stuffs better please try to accommodation the local customs in your dressing sense. First of all you should respect the local custom and religious belief and law of the local people. Though I am also an expat, I always make sure that I wear dress almost what is expected from the locals (Not my native locals). Not to hurt anyone's feelings. Check youtube and other video websites where you can find lot of videos which puts women in embarassing situation when strong wind blows. Lets co-operate
Thanks (Not to hurt anyone, sorry if it hurts)