One difference between Lochcarron and House of Edgar is that fabric from HoE is coated in Teflon (making it stain repelling).

If you're in or near SF, a visit to Wm Glen & Son might be fun. They do Scots Whisky tastings as well as offering made to measure kilts using cloth from pretty much all the premier mills in Scotland. I don't know whether they sew them themselves or import them from a house that sews them in the UK.

Regarding the yardage of cloth in your kilts: one thing I like about St. Kilda kilts is that they actually indicate approximately how many yards of fabric are required for a kilt, based on body size (and incrementally priced accordingly).