Hello Anthony and welcome,
To answer your fabric question the nearest supplier to you is only in Nenagh, Hanly's I think they're called. I'll get you a proper addy later.
That's where Craggaunowen get their costume materials from. We've not used them yet as we've only learned of them ourselves. They don't have a mad selection but it is hard to find fault with. Especially if you keep your kit simple.
Also, we are your nearest group, we do Iron Age and we are only 20 mins from Portumana. Check us out at www.moghroith.org