Thankfully, in our church (Greek Orthodox, in Southern California), people show up mostly on time and dress appropriately, with the exception of some of the teenage girls. They are dressed well......for a Friday night out on the town.
Yes, our small Latin Rite/Tridentine Mass is about like that. The men don't generally wear suits here, unlike SSPX, but dress respectfully. The women mostly wear dresses and also veils (which are provided in the vestibule). It has been a couple years since we had the "teenage girl" problem -- the ones who attend now dress VERY respectfully -- but for a while there a couple of young ladies who happen to be Hispanic were showing way too much. Have since learned that is not at all uncommon at the Hispanic-oriented Vatican II Masses around here. Not sure why they choose to be immodest. The Blessed Virgin Mary has made a point of modesty during more than one approved apparition and I can't imagine that Nuestra Señora de Guadalupe was any different.