Gang members who wear patches or insignia in any government or council building - such as schools, hospitals or WINZ offices - could face a $200 fine.
National MP Todd McClay has had a member's bill drawn from the ballot that would extend the law banning patches in public places in Whanganui, to cover the whole country.
He says people deserve to be free of intimidation.
It could for example mean a parent can't wear gang clothing to attend a teacher-parent meeting.
"And the reason for that is a school's a place where children learn and they're meant to be good, sound, positive environments. It won't stop a gang member going to a school, or a hospital, they'll just have to leave that patch at home."
The bill will now be put on the parliamentary order paper for a first reading.