Trouser Leg Opening Size: What Range is Acceptable, How You Should
For my bespoke trousers I go with a ~22cm (~8.7in) leg opening, which is ideal based on tailor recommendation and personal preference and not chosen based on some mathematical formula (even though it fits the one of Tony The Tailor since I have U.S. shoe size 10.5 and wear flat front trousers)
Size and Fit Guide – G-Style USA
Men's Pants Fit Guide
What is the correct hem length for pants?
Pant Leg Opening Measurement: Find Your Best
How Pants Should Fit
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Men's Fleece Lined Cargo Pant
How To Measure Inseam, Pant Rise & Pant Leg Opening
Wrangler® Denim Loose Fit Cargo Jean
The Correct Hem Length for All Styles of Pants, Style
Alexa Lace Panel Wide Leg Pant Size Chart – Anatomie