It never ceased to amaze me what some people consider appropriate to wear to Mass. I do have a solution when someone’s idea of modesty seems to be nonexistent. Simply have the ushers pass out fig leaves to these people when they come in. The usher simply tells them that even Adam and Eve when realizing they were naked sought recourse to fig leaves. Though as a result of original sin Adam and Eve’s apron of sewn together fig leaves must not have been seen as going far enough for God since he made for them a garment of skins and clothed them.
How cool would that be to have God as your tailor. "Where did you get that suit? Well it is an Almighty original."