N95 Face Mask Cover Pattern  Available NOW!
Chris Francis of Dandelion Designs came up with this version. It does, at minimum, use one 1/4" x 1 1/2" piece of elastic for the nose gather part. She has listed alternatives for the tie strings. For more information on where to donate finished masks, check out: www.masksforheroes.com.
PLEASE NOTE: Important information! 
This mask pattern is designed to fit in two ways. First, the elastic expands, which allows it to fit over most N95 masks to provide a protective barrier, in the hope of extending the lifetime of the N95 respirator. Second, this mask also fits directly over the face, similar to a surgical mask. The mask can and should be washed regularly.

Homemade masks will NOT prevent someone from becoming infected with Covid-19. Homemade protective gear has been approved by the CDC to be used as a last resort when approved Personal Protective Equipment (PPE) resources have been depleted. Thus, the mask created as part of this publication should NOT be used as a replacement for approved PPE.

According to the CDC, “in settings where face masks are not available, HCP might use homemade masks (e.g., bandana, scarf) for care of patients with COVID-19 as a last resort. However, homemade masks are not considered PPE, since their capability to protect HCP is unknown. Caution should be exercised when considering this option. Homemade masks should ideally be used in combination with a face shield that covers the entire front (that extends to the chin or below) and sides of the face.”