How to Wear a Cloth Face Covering

cdc.gov has instructions on how to make your own cloth face covering.

Side view of an individual wearing a cloth face covering, which conceals their mouth and nose areas and has a string looped behind the visible ear to hold the covering in place. The top of the covering is positioned just below the eyes and the bottom extends down to cover the chin. The visible side of the covering extends to cover approximately half of the individual’s cheek.

Cloth face coverings should—

fit snugly but comfortably against the side of the face
be secured with ties or ear loops
include multiple layers of fabric
allow for breathing without restriction
be able to be laundered and machine dried without damage or change to shape