Length of material for a great kilt?

[jhockin]

For an additional opinion on the great kilt/ belted plaid:
http://www.westcoastkilts.com/kilt-h.../kilt-history/
Part of which includes this opinion:
"The old documents describe the ‘big kilt’ as being made of ‘six double ells of tartan material (a Scots ‘ell’ was 37” and ‘double’ means ‘twice the usual width’ rather than ‘twice the usual length; i.e. 54” rather than 27”). In addition, Colonel David Stewart of Garth (Sketches of the Highlanders of Scotland, Edinburgh 1822) very clearly indicated that the cloth was folded in half in order to double the thickness (for greater warmth) before it was worn.

The total useable length was therefore in the region of 3 yards, and if you deduct 4 feet for the aprons, there must have been hardly enough material for more than a few pleats across the back."