Black skater shoes with a casual kilt get-up: fine! Flat cap in the same setting: ditto! "Day" sporran worn at all hours: ditto!

Don't over-think this. At this point, treat your casual kilt as a pair of jeans and you'll be just fine (though I don't like white sneakers with a kilt!).

While your waiting to get properly sized hose, a trip to Dick's for x-large sized hiking or boot socks should fill the bill.

See you on Friday...!