Fashion
Although the game draws some inspiration from real places and peoples, and the general technology level is that of late 14th century Europe, characters' fashion choices need not be rooted in history. As long as it wouldn't be out of place in any given fantasy book or television series or, to some extent, video games, go for it. If it becomes apparent that specific encouragement or prohibitions are needed, I will add those later.
Below are brief general themes for clothing, by region, but don't feel constrained by these.
Adanans often incorporate a sign of which house they are in into their outfits, at least for formal occasions. Adanan tailors tend to produce comfortable, practical, and, by broader imperial standards, not particularly exciting garb.
Dyrians favour loose, airy clothing, sometimes opting for a single knee or full body-length garment rather than a two-piece outfit. They like bright, bold colours.
Hadashis often choose snug-fitting garments. Their clothes are often white, though can have colourful decorations. Outfits frequently incorporate jewellery.
The people of must often, of necessity, be practical when at home, but when in safe places, they sometimes aim for the very height of showy fashion, regardless of practicality.
Thasens favour displays of wealth, though unless there is sufficient taste to moderate it, this can make their outfits ostentatious to the point of being gaudy.