Choose a tightly woven fabric such as cotton or a cotton blend, which provides good filtration while still allowing for breathability.
Use a ruler or measuring tape to determine the desired dimensions for your mask. Cut two identical pieces of fabric using these measurements.
Ensure that the front sides of the fabric are facing each other. This will be the inside of the mask.
Sew along edges with a machine or needle & thread, leaving a gap on one side. Backstitch at start & end to secure.
Gently push fabric through gap, so right sides are facing out. Use a pencil to push out corners for a neat finish.
Create pleats by folding the fabric back & forth in an accordion pattern. Secure with pins for a more tailored fit.
Stitch along the sides of the mask to secure the pleats in place. This will help the mask conform to the shape of your face and provide a better fit.
Cut two 12" strips of fabric for ear loops. Sew them to the corners of the mask. Or use elastic bands/ribbon instead.
Put on the mask and adjust the ear loops or ties for a snug but comfortable fit. Make sure the mask covers your nose and mouth completely, extending below your chin.
Wash your mask after every use. Hot water and soap or machine wash, then make sure it's dry before wearing again.