The Irish flag or tri-colour consists of green, white and orange. Whilst most people wear green, it is just as acceptable to wear white or orange.
It is traditional to wear green for Saint Patrick's Day.
As I understand it Orange was the color that was used to represent Sir William of orange an Irish Catholic hating protestant. I have never seen or heard of anyone wearing orange on St. Patrick's Day.
It means your green stuff wasn't clean.
they wear green
Shamrocks are not orange.
You can wear whatever colour you want on St. Patrick's Day.
wear green
they were green
They wear Green.
Wear green
There is no part of Ireland where it is illegal to wear green on St. Patrick's Day.