There's a mind-numbing amount of faux holidays on the calendar (we see you, Tin Can Day), but Outerknown Blanket Shirt Day is very real. If you're unfamiliar with the celebration, start by acquainting yourself with the titular shirt. The Outerknown blanket shirt is one of our all-time favorite flannels thanks to its ultra-cozy, extra-thick organic cotton, which comes done up in a dizzying array of colors and patterns. It's the perfect midweight layer to pair with, well, everything, especially headed into fall, when the fashion opportunities are damn near endless.