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Its move from a three-ply packet to a two-ply bag using thinner film from a net-zero carbon packaging producer, however, has worked well, said Ms Jones.

The document states that the most favorable option is "a three-ply disposable surgical mask supplied by the district, with the addition of a cloth mask."

Dr. Wen recommended donning at a minimum a three-ply surgical mask — the disposable variety widely sold by the boxful — but better still are the respirators, starting with the gold standard, the N95.

Gaiters with two layers are permitted, and Delta says cloth masks should be made with tightly woven fabric, preferably two- or three-ply.

She’d pass around a catalog and assiduously write out orders on three-ply note pads before mailing them off and waiting weeks for the products to arrive.