Tartan - http://www.siliconglen.com/scotfaq/12_5.html Links collection and article on the history of tartan.
TartanWeb: Wearing the Great Kilt - http://www.tartanweb.com/greatkilt/index.htm How to pleat and wrap the great kilt, also known as the great plaid or belted plaid, the breacan feile, feileadh mhor, or philamore.
Lothene: The Plaid - http://www.lothene.demon.co.uk/others/plaid.html Article on the tartan's history with instructions on how to wrap what became known as the kilt. Linked FAQ also includes some pointers for Viking costume.
Kilt Pleating 101 - http://www.kalani.net/KiltPleating101.htm Two photo series on the pleating of kilts plus textual instructions. Indexed list of Celtic links.
Tartans of Scotland - http://www.tartans.scotland.net/ The register of all publicly known tartans. Includes Irish and North American tartan patterns.
Historic Highlanders - http://historichighlanders.com/ Covering Highland society from 1314 to 1746. Produces newsletter "The Highlanders' Ceilidh". Information on spinning, dyes, clothing, weaponry, and medicine. Instructions for creating a great kilt.