Is wearing a stormtrooper costume outside or in a mall legal?

I'm going to do it so can someone please tell me if its ok.

I think it's legal for you to go to the mall as a storm trooper.

People have done it before; like 'Danny Choo' .. kinda?
-But that's Japan

If it's for filming or photo shoots or just going around randomly it should be fine.
Although I'd avoid department stores or they'll ask for you to leave.

If you do; I wish you good luck and have fun!