Oh, and I don't want to lose this reference (maybe another book I'll get at some point)...
Dress Accessories, c.1150-c.1450 (Medieval Finds from Excavations in London) (Hardcover) by Geoff Egan, Frances Pritchard at Amazon. Lists at $42. Sounds like it should be a reasonable book for the kind of research I'm attempting to do. It is based in London, but it appears as if the Irish raided the British coast very similarly to how the Norse raided the Irish coast during the Viking Age. The only difference being that the Irish did their raiding before the Norse. I haven't found a reference that states that the Irish raided at the same time as the Norse or afterward. Some of the artifacts found along the British coast could, in all likelihood, be Irish in some form or another.
If I find the above book to be beneficial, Textiles and Clothing, c.1150-1450 (Medieval Finds from Excavations in London) (Paperback) by Elisabeth Crowfoot, Frances Pritchard, Kay Staniland is by at least one of the same authors. Lists at $25.81.