I was raised Catholic and for the longest time I would would never think of wearing pants (not ladylike) or going sleeveless(not modest).
NOTE: I am not old enough to be of the generation when women had to have their heads covered too
I am now a Baptist and while I will wear pants and still cover my arms.
AND when I see people going to Mass now; its hard to tell if they are going to a barbeque (or some other causal event) and not worship service.