This mod will bring a sort of hair progression into the game that makes your Sims' hair grow naturally, almost organically.
You can maintain their hair length by making sure you send your Sims off to the Salon (Business Hours: Monday - Saturday, 09:00 AM - 09:00 PM) for a haircut once it reaches "Overgrown hair" status or you can let it grow out after 6 Sim Days has passed. Once your Sim's hair has grown out, the Sim will default to the next hair length unless they get another haircut before it becomes "Overgrown" again.
HIDDEN HAIR GROWTH TRAITS
Automatically all Sims will get a Slow, Average or Fast Hair Growth hidden Trait.
Slow Hair Growth Hidden Trait: Hair will grow .50 less than the normal rate.
Normal Hair Growth Hidden Trait: Hair will grow the normal rate.
Fast Hair Growth Hidden Trait: Hair will grow .50 faster than normal.