But modesty, real modesty, isn't about how much is covered. It is about being appropriate for the activity, the enviroment, the weather, etc.
I can understand when there are religious convictions in the books of that religion to cover certain parts of the body... such as in Islam... but the Bible lacks such clarity. The Bible implies that a person must be appropriate for the occasion at hand, not that they must keep covered in ways that don't make any cultural sense. And in North American culture and society, frankly, showing calf isn't that sexy. A person at a park in the summer will get little attention if they are in knee-length shorts and a t-shirt, but they will get attention if they are wearing a long skirt, leggings, and are covered fully. The question of what is under all that covering may be more alluring than just wearing what is common, modest, and comfortable in that society, in this case, North American society.
Perhaps this example will help bring the subject in to perspective: At a party, it is appropriate and modest to talk, laugh, be goofy, have fun, be outgoing, etc. At a formal business meeting, it is appropriate and modest to wait until you have something important and on-topic to say, and to be in a sober mood.
The issue of modesty is so much mroe complicated than covering everything. It is much more about being appropriate in the time, place, weather, activity, culture.
And one must remember that what is covered can often be more alluring than what is not, to a point...