Remove an existing pin if necessary to make room, and place one of the 12" (30 cm) elastic straps between the two layers of cotton fabric.
Make sure the elastic straps are inserted between the correct layers!
Position the strap so that it runs between one of the upper points that you just marked and the top of the V-shaped cutout.
Leave about 1/4" (6 mm) of the elastic extending beyond the curved edge.
Insert a pin through the elastic to hold it in place, as shown.
Making sure there are no twists in the elastic strap, position the other end similarly on the opposite side of the mask, and pin it in place.
Repeat this process for the lower strap. Angle each side so that it runs toward the closest shallow bottom point.
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