Original notes for creation of face mask from Jonathan’s pattern:
Made in K2 P2 instead of K1P1 rib—CO 88 instead of 90 sts for rib.
To create a safety mouth barrier: after completing, I turned inside out, picked up 15 sts with #5 at beg of mouth shale sts, knitted stockinette stitch until reaching other side of mouth shale sts, bound off, seamed to that side and to edge of ribbed sts if bottom. I left the top open in order to not distort the nose swoop and to leave this as a pouch for a filter if I wish.

Alteration for Margaret, who needs a smaller mask:
CO 76, removing 3 repeats of the K2P2 rib of the neck band.