Get the ears out from underneath the Bald Cap.

Get the model that will wear the Bald Cap to sit up straight. Now make a glued edge of approximately 2 cm along the sideburns. Let this adhesive edge fit up exactly against the glued edge on the forehead. There must not be a gap between them.
Use the same principle: fold back, apply adhesive, reposition the side edge, press gently and fold back again. Allow to dry for about 15 seconds and then apply along the sideburns again.