Best material for a test kilt

[The Wizard of BC]

To give you a comparison of why I am so confused.

I retail 4 yards, of double-width cloth from Lochcarron or Marton Mills, in 16oz weight for $287.00 us dollars, plus shipping.
Shipping to almost anywhere in the US is $23.82usd.
And no duty.

I honestly do not understand where people get the prices of $500, $600 or even $700 for 4 yards of fabric. Heck, that is my price for an entire hand sewn kilt, with pockets!