How to dress ‘Star Wars’ style: Chewbacca socks, flashing lightsaber heels and Boba Fett backpacks

The universe of wearable “Star Wars” merchandise is rapidly expanding in advance of “The Force Awakens” (which hits theaters Dec. 18), giving fans of the franchise the opportunity to work out in Jedi sweatpants, teeter around on lightsaber heels, apply droid-inspired lipstick and tuck their kids into a $4,000 bed shaped like the cockpit of the…