26"pieces of elastic or rubber band, hair ties, or string
Needle and threador bobby pins
Scissors
Instructions
Stack both the pieces of fabric on top of each other. Fold over the long side by 1/4" and hem. Similarly, fold over the shorter side by 1/2" and hem.
You should now have a double-layered stitched rectangular piece that is open at the top and the bottom on the shorter side. Use a large needle or bobby pin to insert the elastic through the open ends at the shorter side. If you don't have elastic, use a rubber band or hair tie.
Knot at the ends of the elastic to make a loop, which will fit around your ears. Alternatively, you can use a string. In that case, tie the string behind your head. Make sure that the elastic loops are snug and the mask fits your face closely.