I definitely mention hair in my books, lol. I'm a hairdresser's daughter and I put a TON of attention/care into my own (very very long, thick) hair. It's a significant part of my daily routine and it generates a fair bit of discussion (friends commenting or asking questions, strangers fawning, etc.), so. I have a scene where two characters are treating wounds/getting dressed, and one of them puts her hair in a braid as they're talking before they leave (expecting to be outside/dirty/exposed to the elements for several days). Long hair has to be confined or it gets damaged and/or is just a pain in the ass (I would go crazy with my hair down and blowing everywhere and caught in my car door all the time) and I think there are definitely ways to use that to enhance characterization; ex. a more physical character is probably going to be more likely to either keep her hair cut off or in a braid/bun.
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