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Random worldbuilding idea: a culture where everyone is a goth, but for perfectly sensible environmental ressons.
Wearing mainly/almost exclusively black clothing because either the dye protects them/the fabric from something in the environment, black clothes are the most convenient ones to maintain, or then a century ago black dye was extremely difficult and/or expensive to produce and only the wealthiest of society could afford it, but now a cheaper dye method has been invented and after a huge trend of Now Everybody Can Wear Black, it just stuck and nobody even remembers why all clothes are dyed black. It's just tradition.
Everyone wears demonia-style platform shoes because the climate is wet and cold, and for most of the year the ground is either muddy or covered in icy slush, so knee-high tall boots are simply the most pragmatic way to keep the rest of your clothes reasonably dry and clean.
Silver and leather jewellery is widespread because the land is rich in metal ore - while the rich can afford to buy/commission delicate silver threads, even the peasants can afford some sort of rough iron chains and studs on their wristbands. Studded leather is more sensible than having metal rings touching skin directly, due to the cold weather. Studs and chains also double as armour and weapons which technically speaking don't count as such, allowing people to circumvent any "can't openly carry weapons during peace time"-laws. Law enforcement could not confiscate someone's bling without causing public riots.
Everyone is about as pale as their natural complexion allows since the climate is cold and dark and the sun does not rise much during the winter. Cold dark winters are also the reason why the culture is so morbid in general - in the heart of the darkest months there's fuck all else to do than write poetry about the moon's silver light and the howls of wolves and the beauty of death, while polishing your iron chains until they shine like silver.
Domesticated ravens are more covenient for messenger birds than doves are, as they're hardier and can manage the climate better. Even if more modern messaging technology has been invented, people prefer sending letters by bird because it's more romantic and poetic. Sending someone a raven message poem about how you'd like to be buried in the same grave together one day is a very standard way of flirting.