Since the Defense Act of 1954 was implemented, it has been illegal for civilians to own or wear Irish uniforms without proper authorization. And since the Irish government does not surplus their uniforms, it is almost impossible to get a hold of authentic Irish DPM. 
 
But The Surplus Front has managed to land a large batch of Irish DPM.
 
First developed in 1999, Irish DPM (Disruptive Pattern Material) has been used by its armed forces ever since. 
 
Available is a Gortex rain parka. These are meant to be worn over your uniform to keep you dry. They feature two waist pockets, one breast pocket, a hidden hood, adjustable cuffs, and an adjustable waist.
 
Only 1 available, size Medium
 
Since these are meant to be worn over your jacket, they run big. The one available fits more like a size Large when not wearing an additional jacket underneath. (I was able to wear this while also wearing a shirt, flak vest, and a parka underneath). 
 
This one is in near-perfect condition with just some storage wear. I don't think this one was ever issued, or at least rarely ever used.