Create the outline by tracing a pair of flip-flops on some cardstock( i actually used an empty cereal box).
Place foot in center of template, mark at the center of ball of foot, mark at center first joint of little toe, mark center of ankle inside and outside.
All slits for straps are 1/4in. from the edge of the templateand 1/2in. wide.
At the ball of the foot, two 1/2in. slits are spereated by 1/4in. centered at the mark made earlier.
At the little toe, the first slit begins at the mark and extend rearward. The second slit is seperated from the first by 1/4in.
At the the ankle, the first 2 slits are centered at the mark and seperated by 1/2in. These slits for a right triangle with its apex pointing toward the inside of the template.
the next 2 slits are at a right angle, to the leading slit you just made, and parallel to each other as well as seperated by 1/4in. from leading end of one to trailing end of the next.
The centerline can be found by finding the center point between the ankle marks and the center point between the marks at the ball of the foot and at the little toe, then connect the 2 points with a straight line extending it to the edge of the template.
Cut out the template.