How to measure a belt
Use a belt that fits you well.
Measure from the buckle pin reference point where the working belt length begins to the hole you use. Buckle construction matters: send a photo showing the belt and both ends of the measurement.
Send the measurement in centimetres. Your trouser size is not always your belt size. If you do not have a belt, measure around the place where you wear it and explain how you measured.
Confirm the size with the atelier before cutting.