Here's a unique idea for a Halloween costume: a snowflake!
You could cut out a snowflake pattern from
some white cardboard, or maybe some foam board,
leaving a hole for your face.
Put a strap on it to reach around behind your head,
to hold the snowflake on your face.
Wear a white jacket with it, and go around saying things a snowflake would say, like:
"Your costume offends meee! You can't wear thaaat!"
"You hurt my feeeelings! I need a safe spaaace!"
"That is so sexissst!" (or racist, or _____ist) (Fill in the blank.)
"That is so insensitive! You can't say thaaat!"
You could mount a GoPro camera on the costume to record people's reactions.
See how many REAL snowflakes are offended by your snowflake costume!
Some cities have a block party every year at Halloween, open to the public.
That would be a great place to try out the costume!