Gripper kits are useful for keeping your garment even and smooth across the platen surface. This will help keep the fabric from lifting on the platen as the print heads move back and forth over the fabric's surface preventing a head strike and or printing alignment issues on the garment.
After installing the gripper kit to your platen simply dress your garment as usual or specialty item and then smooth out the fabric by hand. Gently tuck the excess fabric or strings into the rubber tubing of the gripper kit to secure the material in place. Do not tuck fabric into the gripper kit too tightly to the point where you stretch and distort the fabric.