IHxB01xRAW Beatle Buster 18oz Raw Japanese Selvage Denim Indigo
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The leg opening (and all other horizontal measurements) shrink by the same ratio as the waist does.
So the waist shrinks 1 inch, thus the total shrinkage is 1/34 which is 2.94%
So you will get 2.94% shrinkage on the 9.1 measurement of the leg opening. Which is approx .26 of an inch. So will end up at approx 8.8.
BUT, there is always a plus or minus sewing tolerance, so the original 9.1 is an average anyway.