I thought I'd follow this project through here in more detail, so I'll begin with the main references I have to hand. These are:
Irish Battles, G A Hayes-McCoy (Appletree)
From Clontarf (1014) to Arklow (1798) this is the best book on its subject.
The Irish Wars 1485-1603, Ian Heath and David Sque (Osprey)
Thanks to the old WRG range of uniform books, Ian Heath has been my staunchest authority for uniform detail throughout my miniatures painting career.
Armies of the 16th Century, Ian Heath (Foundry)
Galloglass 1250-1600, Fergus Cannan (Osprey)
This is a new acquisition. Ospreys can vary. This one looks good.
The Border Reivers, Keith Durham & Angus McBride (Osprey)
Another good Osprey with good illustrations of Elizabethan clothing. I may move on to the Borders later.
Renaissance Armies 1480-1650, George Gush (PSL)
An old book, but it still provides a good overview.
British Military Uniforms From Contemporary Pictures, W Y Carman's (Spring)
Another old book but it may have some information of interest.
For more general background, I also have John Sturt's
Revolt in the West and Anthony Fletcher's
Tudor Rebellions. There are some other titles I might find in my book collection and I've ordered a few other books which I will mention later if and where relevant.
One clothing issue I've encountered already is the question of sleeveless doublets. Despite the assumptions of Hollywood as well as some re-enactors and illustrators, it appears that sleeveless doublets were rare. I guess that if you are going to wear a jacket it might as well have sleeves, and that shirts were regarded as underwear and not normally exposed except when doing heavy labour. This will be important when painting English and similar infantry.