Cut two leather pieces:
a) small one: couple inches/4-5cm should be quite enough.
b) bigger one: Measure your wrist. You will need to add 2 inches to your wrist measurement so you will have room to add a small piece of velcro tape.
Measure centre from the bigger leather piece.
Roll the small piece around the centre.
Sew the ends together.
Set and shape "bow".
Sew velcro tape to wristband's heads.