I first measured them with jeans on and got a loose 38".
Without the jeans I measure a very loose 37", snug to 36" actually.
With very light pants I got 37.5".
Just measuring my rump I get 19.5 - 20".

I initially ordered my USAK Casual at 38", but emailed Rocky and told him I thought 37" would be better. Now I'm not so sure. One reason I'm ordering this casual kilt before a wool 8 yarder is to wear it a bit and be sure I've got my measurement s correct, but I also do want it to fit at least reasonably well. Before they get started on it I'd like to be sure they've got the right numbers.

What should I tell them?

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