Mathew,
Having lived in both Ottawa and Montreal, I do appreciate the kind of bitter winter weather that you are talking about.
However, I am going to suggest that bare knees and updraft are of more concern than the amount of wool around your waist. An 8 yard kilt of 16 oz fabric will potentially be a bit warmer than your 5 yard kilt (I have a 4 yard 16 oz box-pleated kilt that I wear all year round, but my "tanks" are somewhat warmer).
Remember, however, that more yardage and more weight means a bigger mass of wool to sit on all day.
St. Andrew's Society of Toronto
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