In a past episode of SBS's 'Running Man', Song Ji Hyo was seen wearing this interesting hat along with an orange polo shirt. Apparently, this hat is quite popular due to the quirky monster design. It's been seen in the past on 2AM's Jo Kwon, Gong Hyo Jin, f(x)'s Sulli, and countless other celebrities. A hat like this can go along with almost any casual outfit, and it's definitely an eye-catching item. This hat is from ELSTINKO and retails for approximately $46 USD. Source + Photos: Style M, Hat's On