Without knowing gender, I’ll keep this pretty vague.
I’ve also got a request out to the Facebook Group, SCA Garb, for more resources. They can be really helpful folk.
Clothing culture, 1350-1650
Publisher:Aldershot, Hampshire, England ; Burlington, VT : Ashgate, ©2004.
Series:History of retailing and consumption.
Summary:From Russia to Rome, Ireland to France, this volume contains a wealth of examples of the numerous ways clothing was shaped by, and helped to shape, medieval and early modern European society.
Dress in Ireland
Publisher:New York : Holmes & Meier, 1989.
Encyclopedia of dress and textiles in the British Isles c. 450-1450
Author:Gale R Owen-Crocker; Elizabeth Coatsworth; Maria Hayward
Publisher:Leiden ; Boston : Brill, 2012.
Sources for Irish Re-enactors, from the Reconstructing History blog – includes a bibliography
Good luck, and have fun!