A quick note on the historical antecedents of Karagon/Shayard/etc.
I’m not a fan of the Guy Gavriel Kay school of fantasy, whose worlds mimic Earth-historical cultures so closely that they beg the question of why the author didn’t just write a historical novel. (GGK’s answer has something to do with the privacy of historic figures, which strikes me as just barely on the respectable side of eccentric).
It probably goes without saying that both Shayard and Karagon are, fundamentally, mash-ups which draw on multiple streams of history and speculation. Karagon is a Greek-inflected culture mainly because that allows me to pull in a rich religious and philosophical vocabulary from our world, in a game which is meant to be very much about political philosophy and faith (while hopefully also staying fun). Greek has also contributed so many rich words to the English language that it’s both possible and fun to play with the language of a Britain-colonized-by-Byzantines, where the high-culture vocabulary is Greek rather than Latinate.
Some of the Greek elements are classical, many are Hellenistic, some are Byzantine… and some are pure speculation about what we’d see in a Hellenic empire that remained world-beating for three centuries during the dawn of a blood-magic-driven industrial revolution (starting much earlier than in our own world).
So there will be many places where the nations of CoR differ from their most obvious historical antecedents. I’m concerned with the internal plausibility and coherence of the civilization, not consistency with the Earth template(s).
Which is to say: @FairyGodfeather’s challenge is entirely legitimate. Just because the Earth cultures I’ve had in mind as models for Karagon and Shayard have tended to eroticize breasts doesn’t mean that needs to carry across to the gameworld. It’s consistent with the gender-egalitarian but sexually controlling culture of the Hegemony that the higher classes wear clothes concealing all skin bar the neck, head, and hands, while the laboring classes (both men and women) wear less when they’re hard at work – and are equally shamed for it, regardless of sex. So please retcon my previous answer accordingly.
I’m still chewing over the specific clothing styles of the world, which is one reason that the game as written is a bit ambiguous on the topic. The other is that I don’t personally find that very important when it comes to immersing myself in a world; indeed, more than a few lines describing clothing and I’m more likely to be pushed out than drawn in. (Looking at you, George RR Martin). Obviously, that’s not the case for everyone, though, and I don’t want to write so little on the topic that I alienate people. 
I don’t currently intend to add any more sections to the World Index, as I think it’s already a bit long. A lot of people start reading with the (whole) World Index, and I’d like to get them into the game as soon as possible. But I’ll try to write more explicit descriptions of clothing into the text, to satisfy the curious.