The common thread in all of the comments is "Respect".. Deal with it and you will not have to be concerned. Minimal clothing doesn't have an appropriate place in churches.

When in Toledo, I wore shorts walking around town - it was in the mid-90s...but I carried a pair of pants in a small bag to wear over my shorts in the cathedral. That was 6 years ago.

SS

I was thinking of Sagrada Familia in Barcelona which isn't anywhere near the Ramblas. But I think whether it is or not is irrelevant, the major historic cathedrals in cities are going to attract tourists no matter where they are and that may be what they are wearing in summer.

I fail to see what is obscene about bare arms, which was what was cited as not being allowed in Barcelona, nothign to do with bikis or short shorts. That is why it is so weird a position. First, the idea that your upper arm is obscene but not your lower arm is just nonsensical in itself. But I've seen lots of women with bare arms attending Mass in lots of countries and the priests don't care. IN fact, I attended Mass in Paris and one of the main participants up in the alter area was a woman wearing a dress with a tank top (ie, narrow straps). It was summer, but that kind of surprised me. The French are pretty liberal about these things, obviously. I still think the issue of bare arms is silly, it's just skin like skin on your lower arms or lower legs. It is not remotely sexy on most women, that's for sure.

In greek monasteries, women were not permitted access wearing pantaloons (sic). To say nothing of muslim countries...

I took a picture of my sister being denied entrance to St. Marks 40 yrs ago. She was dressed nicely, just didn't have sleeves on that dress. In the picture is a young woman getting in wearing jeans - something that would have been looked down upon at my church.

It's never about being dressed nicely, it's just about being appropriately modestly dressed. Many Catholics visit from all over the world who can't afford expensive clothes.

Knees and shoulders should be covered (both men and women). I assume the same goes for midriffs. They may also have a problem with offensive t-shirts but I've never heard specific rules about them.