Just as a point of clarification, Lochcarron's site lists the MacLachlan Old in weathered colors on their Strome (16 oz) cloth page:

http://lochcarron.com/tartanstrome/maclachlan_old.html

If you'd like a kilt in MacLachlan Weathered in 16 oz, it is possible from anyone who carries Lochcarron cloth (including us ).