I also wanted to add screenshots of very old highlander hairstyles that showcase sufficient curls in-game, provided by PudDraws on Bluesky.

The curls here are mostly achieved with a flat 3D model (were you to turn these hairstyles at the right angle in game, you'd see the curly strands 'disappear', because it's basically got the 3D shape of a piece of paper) and well-articulated normal texture. Several straight-haired styles in the game have lots of these features too, and much of the fluffiness of some shorter hairstyles is achieved through that same "flat 3D model with detailed normal" method. The bulk of the hair would be, without its textures, just a weird hair-shaped blob, and the normal would again add the curls and depth. Again, this is how all the hair is designed already: look at any model and you'll notice that, aside from some strands and such, the bulk of the hair is one 3D hunk, and it's the textures that make it appear more like a full head of hair.
Ultimately, making a faithful translation of the original entry winner's hairstyle would be completely within their ability, and the fact they thus chose not to is upsetting. I won't speculate on their reasoning, but I will say this: We do not need more hairstyles that can realistically be worn by straight-haired or vaguely wavy-haired people. We have tons of those, and those people can MORE than afford to be left out of a few hairstyles that black and brown people would be able to realistically and EASILY wear. The fact is, making a straight-haired or wavy-haired WoL is easy in this game, we have tons of options for this. What we DON'T have are almost ANY options for curly or textured hair, and that makes it really hard for anyone to make a WoL who is black, brown, or even just someone with very curly hair. Instead, these people have to compromise with hairstyles ill-suited to their visions, and that's unfortunately a reality in SO many games that pride themselves on letting the player design their very own character.