There are many modes of Islamic women's dress of which the burka is the most extreme. The niqab also covers the face with the exception of the eyes. Like you, isthis, I don't like these at all. To see a family out feeding the ducks, the children and father wearing jeans and sweatshirts, with the mother entirely enclosed in a burka made me feel intensely uncomfortable, as if the mother was of a different species, or in some kind of servitude. I don't know what is worn under the burka - anything from thermals to almost nothing, I shouldn't wonder. When I was an ESOL teacher, during the coffee break when the male students had left the room, an Iranian woman showed us what was under the scarf and coat - astonishingly, cropped blond hair, jeans and trainers, much like the French girls in the same room.
One day, perhaps, the burka will be a thing of the past but it will take cultural change rather than statutory measures to bring this about.