"Flannel shirt and Blue Jeans"?
You just described how I am dressed alot of the time I'm doing house tours here.
I sweat way too much to keep any make up on my face.
Maybe if you were older (like me (57)) you could get away with wearing no make up, mask or such things and still be scary like I am. I tell them stories about this house as they sit in the front room.
I can scare them, make them laugh, scare them again, make them laugh and sometimes during October all of this happens in just ten minutes.
(You "reset" them for the next scare when you get them to laugh.)
All along keeping it my little secret....am I really as nuts as I can seem to be? I just dropped the big steel bar across the door behind them as they walked in, it's my house, surrounded by parking lots, behind the storefronts, east of the 6,400 grave, grave yard . Woods, stream and nothing to hear you scream to the north, but if you scream too loud you upset the deer and coyotes!