HDG's hose are perfect for casual wear (all though I wore the off-white to a wedding when I first started wearing a kilt. No one noticed anyway)

Matts are very nice and could be worn at various levels of formality.

Freedom Kilts has Heritage Hose that are almost handmade (made by an antique knitting machine I believe). PM WizardOfBC or Email him at the shop (link at top of page).

Also look at the Pipers hose carried by several vendors here. Those fit my 19" calves very well.