Just develop a policy that lists a number of hairstyles not approved for work.
Then its not just against any one particular hairstyle.
Problem solved.
Most of these are related to sanitary reasons - ie like long hair not shedding or dropping into food, or for operator safety reasons - like hair not being pulled into gear/wheels of huge machines.
Don’t you get it. The law was made for black people because everyone is against them and their hair because everyone is racist.
They will wear their hair however they want it.
Hair nets and safety hats are for white people. Black people have special hair so they need special provisions and laws to protect their hair.