How to order the correct size leather belt seems to cause people unnecessary problems and results in my being asked the same question half a dozen times a week at least. Thanks to more than twenty years of solving this dilemma for my customers, I felt it worth sharing the solution with those of you facing such a decision or anyone who might be interested.
Taking a leather belt you use regularly, thread it through your preferred or current favourite trousers/denims. This will get around the problem of where on the body you are currently wearing them e.g. on the hips or waist which can make a difference of up to four inches.
Fasten your leather belt comfortably and in the preferred position on your waist noting carefully which hole you are using to fasten the buckle tongue through. This is usually obvious from the mark left by the buckle tongue from continued use.
Remove the leather belt and lay it flat on a table where you can now easily measure with a tape from the hole discussed above to where the leather turns through the buckle. N.B. Make sure the belt is flat on the table and is stretched out tightly and as straight as possible otherwise you will get an incorrect measurement!