Downix, I know that you have resolved your issue for now, but may I make a suggestion or two for your son-in-law's future kilt? An 8-oz Strome Davidson weathered (http://www.lochcarron.com/tartanstro...dson_clan.html)
One of the finest of the Davidson tartans, but it needs to be made in a full 8-9 yard and can't be pleated to the stripe because of the sett size.

I have modern Davidsons in 16 oz Strome pleated to both sett and stripe and far, far prefer the former.