What should I be?

I was thinking maybe a flapper or Daphine for Scooby-Doo, but I'm not exactly sure

Both ideas sound cool. If you're going to be outside, then make sure you are wearing something warm. If you don't want to be cold, I would go with Daphine, because you could wear a warm sweater and if you are a flapper and wear a dress your legs might get really cold.

My daughter just messaged me on MSN that she is going to a Halloween party as a flapper, then said I was a Dapper
I don't know what either is or if I was insulted or complimented.
Don't have any ideas for you but if you tell me what a flapper is I can work on some.