How did I miss this thread? I'd love to reply to some posts individually, but most of it has been said. I'll just set out my own feelings.
My morality is very simple. Do what you want, but don't harm others. Simple, but it gets more complicated in application.
What is "harm"? I think most people would find this easy to answer, when the action is applied to themselves. It gets more complex when considering others. What follows flows from my own definition of "harm".
As far as dress codes go, wear whatever you want including nothing. No harm can result from looking at another person.
But what about offending others? I reply, what about the offendee being less easily offended? Years ago, there was discussion on British TV about men having long hair. It was around the time when the Beatles and others were "offending" people with their long hair. A young man had been banned from school for having long hair. The Headmaster (bald himself!) said among other things "It offends people". I found myself amazed that anyone could find offense in the length of someone's hair. Interesting that today, pretty much any hairstyle is accepted. I guess it didn't prove to harm anyone.
But what about offending God? According to whom, I ask. God doesn't seem to mind in other cultures, in fact He tends to be silent on most things, leaving it to humans to claim all kinds of things in His name.
As far as nudity goes, nothing is less sexual. Nudist colonies are not hot beds of depraved sexuality, quite the opposite in fact. What is sexually stimulating is revealing a part of the body that is not normally revealed. Women's fashion cyclically reveals and conceals different parts of the body as we get used to the latest "part" and it is no longer sexy. Reveal everything and after a while it isn't note worthy. Fundamentalist Islam is in fact creating the problem that they try to solve. The more you cover women up, the more fascinating the slightest "reveal" becomes. A friend long ago had a job in a Muslim country where women were typically covered. Saudi Arabia? Can't remember. He and his wife went to a beach, and she wore a bikini. (The beach may have been set aside for western workers, I think they have similar places for drinking alcohol). A group of local men gathered round her, not threatening but simply staring at her. They would not go away when requested to. They just stood and stared. Can you imagine that on a European or American beach?
My objection to the treatment of women in (some) Islamist countries is that they are forced to wear certain clothes, not that they do. If they want to wear concealing clothing, then they should be allowed to.