GAW, Rabbeinu Yonah, off hand.
Yittai, do not go there. I know all the reid you are going to say — most Poskim do not hold like that. So, stay in YU and tell the ladies there to get dressed.
P.S.: I do not wish to enter here into a full-blown discussion of the sugya — the cr is not the place for it for a number of reasons.