In my best Seinfeld impression, "What's the deal with checkered kilt hose?"

I was just at my local kilt shop, getting the SWK Lamont altered at the waist, when I saw that they had a pair of red/black diced kilt hose for sale. One pair, in my size, regular $230 on for $35!!!!!! I couldn't resist. So now, my question is, what's the etiquette for wearing 'em? What were they originally worn with, for what purpose? Are they military? Were they formal? Do they have to match a kilt?

Signed,

Your friend kilted in the cold,

Keith.