It is my understanding that addons such as FlagRSP and MyRolePlay are intended to facilitate roleplaying by allowing a player to describe things about his or her character’s appearance that can’t be portrayed by the in-game character models — things like being taller or shorter than average, having a different body type, scars and/or tattoos, excessive jewelry (like a Draenei I know) or the complete lack of jewelry (useful for characters like Trolls for whom the model always has earrings), hair that is greying but mostly the normal color (so using the gray hair color wouldn’t be justified), pregnancy, signs of illness, fine details of clothing and other gear, et cetera, et cetera.
I’ve written before about how I think there just aren’t enough curly hairstyles in Azeroth, and something I’d absolutely love to see is ringlets, like those on the back of the Draenei “jeweled band” style or the Goblin “elegance” style, on a Tauren woman. I think I’d describe it in an RP addon something like this:
Where many other Tauren women have braids, Kaiuna’s hair hangs down in long, untidy ringlets. Likewise, the mane on the back of her neck is a disheveled mass of corkscrew curls. Even the tuft at the end of her tail is curly. If you can get close enough, or if you see her in Cat or Bear form, you can see that the short fur on the rest of her body is also wavy or slightly rippled-looking.
She is wearing a heavy leather jacket that appears to have been reinforced with pieces of tree bark around the ribcage.
In horses, curly coat is quite rare and has to be specially bred for. I think it might be more common in cattle, but I’m not certain. In any case, I think that curly-haired Tauren are likely to be somewhat uncommon, and it would probably be a trait that would run in one (maybe two) specific tribes.