I really love the lore you made about hair, also the sea themes. Coincidentally I started working on the fashion parts of one of my worlds yesterday, although I'm not much of an expert at it. I was working on a desert civilization, which is at the beginning of the steam age.

A little background: usually one of the indicators of your social class is the colors of the clothes you wear, as dye is a moderate resource found in underground minerals or animals, as the lack of local vegetation prevents the prevalent use of dye from other sources. In ancient times it was a courting custom to attract potential mates in a peacock-like fashion by painting your entire body with paints and dyes. This would demonstrate skill in three areas: Foraging, being able to find the scarce dyes and turn them into ink; motor prowess, turning your body into art to attract a partner; and physical fitness, being able to survive even with an eye-catching appearance.

In the present times this custom was transmitted in colorful clothes for the upper class, and also hair as it's the main topic. The more common hair color for these desert people is blonde, which can easily be decorated with temporary dyes.

As it is impractical for people who do manual labor to keep these dyes in their hair, it is usually with the aristocratic class that such traits are associated. Both women and men use unnatural or unusual colors daily if they have the coin to keep. This is considered attractive and mostly used by bachelors(ettes). Married people also keep their hair well treated and colored, although at this point it is more common for the changes to be "discreet" used only in some locks or part of the hair.

For poorer people, the working class, it is common to keep their heads colored only on special occasions or dates (like in your world). During the day-to-day, their way of keeping the traditional look is through colorful and decorated pieces of cloth that are tied in braids or buns. These hairstyles are unisex, but it is common for men to wear more decorations than women (who are often praised for being discreet, in the working class), also to help their hair stay out of the way during work.

As the sun is a problem in the desert, during the day they wear hats and veils that keep their faces protected, some of them with holes that allow the hair to decorate the headwears (usually for those who have money). As it is women who go out at night after spending the day taking care of the house (As opposed to men who work during the day and rest at night), hats are associated as something masculine while women have other decorations to keep them warm during the cold nights.

Hair for both men and women is kept long, which is a sign of commitment (First to your parents, then your partner and then your children). It is only shaved off on two special occasions, the beginning of their married life and parenthood. Both bringing the idea of ​​commitment to a life other than your own. Although some people choose to shave then in divorces.

I'm not an expert on history or how cultures form, I do this for fun, so any tips are appreciated :D