The ao dai (áo dài) is a Vietnamese national costume primarily for women. In its current form, it is a tight-fitting silk dress worn over pantaloons. Áo dài is pronounced (ow yai) in the South, and (ow zai) in the North. Áo is derived from a Middle Chinese word meaning "padded coat" In modern Vietnamese, áo refers to an item of clothing that covers from the neck down. Dài means "long." (WikiPedia)
I think the Ao Dai could be 'Islamicized', obviously by not wearing a tight fitting one, try a size or two larger than your normal, and ensure that your pants fully cover your sides and legs.