This week on the Slate Plus Hang Up and Listen bonus segment, hosts Stefan Fatsis, Mike Pesca, and Josh Levin discuss trends in athletic gear for colder seasons. When is it appropriate to wear long sleeves in baseball? What about parkas in football? Was the hat with built-in earmuffs a lasting innovation? The hosts share their opinions on seasonal apparel and its effect on gameplay. Additionally, the panelists brainstorm their own innovations for cold-weather sports attire.