By coincidence, I heard this at morning too:

"Give a man a mask and he will tell the truth" - Oscar Wilde

This is why Halloween is so popular with adults. Once you get past the lazy Sexy _____ costumes and into the ones that took some thought, you wind up meeting some interesting people. If you take the time to come up with your costume, you naturally start becoming that character in just the decisions of what they would/wouldn't wear because you're already thinking of the back story.

Carnival comes to mind https://en.wikipedia.org/wiki/Carnival