If you're in the US, the heavy thread that I find readily is Coats & Clark's button and carpet thread. There are some in between weights called "heavy"---that is, noticeably lighter than the button thread, heavier than regular.
More is revealed in The Art of Kiltmaking, at your favorite highland outfitter or directly from the author.
P.S. there are some Gutermann upholstery and heavy duty threads that I have not tried.
Last edited by fluter; 10th April 13 at 07:02 AM.
Ken Sallenger - apprentice kiltmaker, journeyman curmudgeon,
gainfully unemployed systems programmer
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