From the OP website, they quote from this encyclical which perfectly describes what I see today at SSPX chapels with the way the young girls are dressing:
Encyclical - Sacra Propediem
On the Third Order of St. Francis
Pope Bendict XV 1921
19. From this point of view one cannot sufficiently deplore the blindness of so many women of every age and condition; made foolish by desire to please, they do not see to what a degree the in decency of their clothing shocks every honest man, and offends God. Most of them would formerly have blushed for those toilettes as for a grave fault against Christian modesty; now it does not suffice for them to exhibit them on the public thoroughfares; they do not fear to cross the threshold of the churches, to assist at the Holy sacrifice of the Mass, and even to bear the seducing food of shameful passions to the Eucharistic Table where one receives the heavenly Author of purity. And We speak not of those exotic and barbarous dances recently imported into fashionable circles, one more shocking than the other; one cannot imagine anything more suitable for banishing all the remains of modesty.