This question has options. How would someone go about accomplishing this goal?
To determine the appropriate length of leather bracelet using an old leather belt.

Options are:
+ Cut the leather belt in the appropriate length by measuring the circumference of your waist and then subtracting 5cm.
+ Cut the leather belt in the appropriate length by measuring the circumference of your leg and then subtracting 5cm.
Cut the leather belt in the appropriate length by measuring the circumference of your leg and then subtracting 5cm.