County colours (Gaelic games)

The county colours (Irish: dathanna na gcontaetha) of an Irish county are the colours of the kit worn by that county's representative team in the inter-county competitions of the Gaelic Athletic Association (GAA), the most important of which are the All-Ireland Senior Football Championship and the All-Ireland Senior Hurling Championship. Fans attending matches often wear replica jerseys, and wave flags and banners in the county colours.

Source: Wikipedia — County colours (Gaelic games) (CC BY-SA 4.0)