"Coronavirus masks are being made from MLB uniforms - The masks are made from the same bolts of polyester mesh fabric used to make big-league uniforms, and the first prototypes bear the distinctive pinstripes of the New York Yankees and the Philadelphia Phillies..."
https://www.chicagotribune.com/coronavirus/ct-nw-mlb-uniformscoronavirus-masks-20200326-vcqilgvugzcj3jbzedn5falsua-story.html