Sorry to spoil the fun, but I thought I would inject a bit of reality into the conversation. I have witnessed several of the priests in Post Falls correct girls on their dress. One of them stopped a girl on the sidewalk and told her she needed to go home and put on a longer skirt before she went inside to Mass. I have also heard multiple accounts of young women being pulled aside by priests and corrected on their attire. It is absurd to think that the priests have the ability to correct every offender, with the size of some SSPX parishes.
As to the poster who said they don't have the same problem at his FSSP chapel, I can only say that if that is true, your parish must be an exceptional example of Catholicism. A family I know who left IC for the FSSP parish in Coeur d'Alene said one of the things he liked about the fraternity was that "they don't hassle my girls about the way they dress."
Yes, it is a problem. No it is not a problem specific to the SSPX. I remember much worse dress by the girls I saw at Mount St. Michael's in Spokane (one high school girl was wearing a Hooter's shirt after school, just to illustrate my point). It is everywhere, sadly, and from my experience the SSPX priests are doing their best in this matter. However most of you would be impossible to convince of that due to your preconceived biases.