Yes it's just a mask. I bought on clearance, with my employee discount at the time, for about $25 bucks. The hat was $3, the glasses $4. The suit I wore to my brothers wedding. You can't see in the pic but I have cartoon (four finger) gloves and clown shoes.
I'll try and find my zombie pics. I hid in the garden with my fog controler taped to my back so when I leaned slightly it would activate. They thought I was a prop...until...