Place the adjustable Velcro strap evenly across the back of the vest, ensuring it is facing the correct way. Attach the two buckle pieces to the front.

Put the vest on, loop the straps through the buckle holes, pull to your desired tightness, and reattach the Velcro straps to the back.

Take the vest off so you can easily make the final adjustments to your preferred fit. Tuck any excess Velcro securely underneath the back flap.