In no particular order, I am currently 'jonesing' the following (apart from the X Marks T-Shirt!):

8yd 16oz 'Cornish National' from Cornovi (Cornish Tartans)
8yd 16oz 'Randonnée Bretonne' [Brittany Walking Tartan] (tartanbreton.com)
8yd 13oz 'Shepherd Tartan/Northumberland Tartan' from Geoffrey (Tailor) Ltd.
6yd 'Snakeskin' Leather from TFCK (this is going to be a long jones!!)