I took a look at that site, and $30 per yard is not correct. The lightest you will want for a four yard kilt is 13 oz wool, which they have the Bluebonnet tartan listed, in 54" wide cloth, for $74.95 per yard. So, you'd need two yards (assuming your measurements are 46" or less), so that comes to About $150. Then I charge $220 for tailoring, which makes your kilt $370. Not bad.

If you wanted a heavy weight cloth, I can have that custom woven for you for $65 per yard, single width. That kilt would come to $480.

Aye,
Matt