There is no particular tradition about wearing jackets and caps on St. Patrick's Day in Ireland. Some do and many don't. Those that do would often wear jackets and caps on other days too.
Donegal tweed jackets and caps Donegal tweed jackets and caps
Pat Jennings with 119 caps
Shay Given has won 78 caps for Ireland as a Newcastle player...
shay given has played 118 games for ireland
Steve Staunton had 102 caps
Peter Shilton (England), with 125 caps. Second comes Pat Jennings (Northern Ireland) with 119 caps.
Harris Tweed is a haberdashery specializing in men's tweeds, suits, jackets, trousers, overcoats, vests, and caps. They also have women's skirts, trousers, coats, and jackets available for purchase.
122 (as at 20/09/2011)
A company can have its name put on a variety of items, such as caps, glassware, gym bags, jackets, key chains, and pens.
Their typical clothing were outer jackets, knee pants, long black stocking, and flat caps.
Lilian Thuram with 142 caps between 94 and 08 scoring 2 goals http://en.wikipedia.org/wiki/France_national_football_team#Most_capped_French_players