From Toronto, Ontario, Canada.

I would think that a Sport Kilt may just be too thin for winter kilting I have a bit of experience in it. I was kilted all last winter and was out in nothing less than a 16 oz kilt. Here are some photos.
This is a 16 oz kilt with a tweed Waistcoat and Jacket.


This one is a Military Replica 22 oz kilt from What Price Glory just the thing for winter kilting.