The GER Mood Sweater by SENSOREE is a unique wearable device that can actually change color based on your mood. Kind of like a Mood Ring, but cooler:
The GER: Galvanic Extimacy Responder sensors read excitement levels and translate the data into a palette of affective colors. The high collar, bowl positioned with LEDs reflects onto the self for instant biofeedback and acts as a tele-display or external blush for the other. Located around the larynx, the visual interface replaces speaking, as the wearer’s truths are instantly expressed with color.
But we doubt you'll be able to get it packaged under the Christmas, as SENSOREE is only making 100 of these sweaters, and will only taking pre-orders for purchase in March 2014. Check it out: