Right, everyone has the freedom to dress how they want. However, it doesn't mean that we should make it socially acceptable to treat women in that fashion. For example, in the city I live in we have one of the largest Somali and Sudanese communities in America. I get out and run over lunch a lot. Well, run or lift weights. When you are out walking or running, you will notice a lot that people in cars typically don't notice. For example, it is an very common occurrence for me to see Somali or Sudanese families walking down a sidewalk in 90 degree plus heat, extremely humid, the son's and the father dressed in shorts and a t-shirt or in some cases just a tank top, while the older daughters and wife is covered head to toe in a niqab.
Now, you might say that is their choice. Those women choose to dress that way. Well, is it really a choice when they are told their whole life that refusing to dress that way will mean they are whores and will burn in hell for all eternity? Is it a choice when they are beat as teens if they refuse to cover themselves head to toe?
I can't think of anything more antithetical to liberalism to think that Muslim women are different species than other women, and that they have different wants and needs in life than other women. Yet, that is exactly we effectively do in the west.