• the Sweater Vestival is a day of sweater vests
• we accept wool, mohair, cashmere, acrylic, rayon, orlon, cotton, and other sweater-like materials
• vests of fleece, GORE-TEX, and other space-age materials which come with lots of little pockets, pull-strings, and "features" do not count as sweater vests -- even if they have no sleeves and are otherwise vest-like
• knitted (or crocheted), not woven
• this is both not a joke, and also funny