Do they dress the way they do because they have ulterior motives (a vice cop going undercover as a street walker). Or because they were ingrained by thier family or expected to dress the same way by their friends.
Fashion is the ultimate peer pressure.
In fantasy, we might not spend a lot of time on fashion -- he wore the baggy, rough garments of a farmer. But I've been thinking a lot about it.
The world of Celta has a Regency undertone, probably because I read a lot of them. I have been accused of not being able to write a contemporary book because my tone is too historical. Maybe. We'll see if I can pull off that Urban Fantasy.
In any case, Dufleur Thyme is facing The Social Season (you don't say "no" to GreatLady Holly, and SHE has an agenda (and it wasn't a surprise when I wrote the pages to see that she did. It was something I didn't know about, but not a surprise).
So I've been thinking about what the elegant and fashionable wear during the Social Season on Celta a couple of hundred years after colonization. I've always emphasized the difference between commoner and noble clothing, the fabric, the wideness of legs and sleeves. I'm thinking that this year, the men are wearing turkish trousers, those that bag and are gathered at the ankle. Robes are IN.
So it's a topic that you should consider in your writing. Having bad hair days happen to many people and it's an irritation that can set your characters' nerves on end from the moment they wake up.
May your costuming be interesing today.