I, too, live in Florida. I see some pretty skimpy outfits in church. They keep the air-conditioning in my church pretty chilly during the summer - intentional, perhaps?
At the beginning of fall semester, as the college students were trickling in, the priest gave a good - not too harsh, but fair - sermon about dressing modestly for church, making the points several made here, that it says you think the Mass is important and God is important and worth putting on your good clothes for. He also mentioned getting ready early enough to arrive on time, because it is important, not an afterthought. Unfortunately, I see no abatement of the things he spoke about.