Legal question about Antique vehicles and the seat belt laws

Generally if it didn't come with them you don't need them but if you install them you have to wear them .I have lived in states such as Michigan where they can't pull you over for a seatbelt infraction they have to pull you over for something else then add the seatbelt ticket but we all know how that works in practice . Here in Canada they are hard on it but I have cruised around in my 69 and others with no shoulder strap on just the lap belt and never been grabbed for it here .
PS I am sure there are states that won't tag a vehicle of any age that hasn't been upgraded to their safety standard including seatbelts .