For the Irish National, I think bottle green hose with yellow flashes, or yellow hose with bottle green flashes would work well. Both Jock and Nighthawk like maroon hose. I would try maroon hose with either yellow or black flashes. Not sure about the green tie for dress. I would suggest trying it and see how it looks.

As for the IoS, Glen has demonstrated some nice choices. I would suggest following his lead.