Disheveled hairstyle mechanics

Some hairstyles should get disheveled by certain activities. 

For instance, long straight hair could get messed by sleeping for more than X hours or getting into a fight. Running outside, windy conditions, swimming. Wearing a hat would prevent it, though. Updos/Braids could get undone, letting the hair down. Some hair textures could make the coiffure get more voluminous after swimming or going in the rain. Maybe add a wet state that gets disheveled after drying up.

Good or superb WooHoo could make a combed, parted hairstyle get messy. Poor performance, OTOH, would not. If a couple goes to a club and one of them makes out with a stranger in a closet, they get out with disheveled hair and their partner could get jealous if they see it. 

Children’s hairstyles would get messy after horseplay. Adults could affectionately mess a child’s hair, and parents could fix them or tell the child to comb it properly. If the child themself does it, it raises manners and/or responsibility. 

Disheveled hair could be combed in any mirror, reverting to a tidy style. Slob or lazy Sims would get a negative moodlet by doing it, while proper or neat Sims would get a positive one. 

Disheveled hairstyles wouldn’t be selectable by themselves in CAS, being solely variations of pre-existing styles. If a player wants to use it on a specific outfit for a look, they could manually mess it up using the mirror.