As the title says. For a primary school dress up day centred around things starting with R. I imagine ther will be a large number of rabbits and robots etc & I’m after something clever and original.
If you’re left-wing, dress like Garrison Keillor and claim to be a “raconteur”.
If you’re right-wing, go as Ronald Reagan.
If you’re lazy, just dress in red Rayon.
Blue shirt. Any colored long pants. Belt with a red buckle. Hair flattened.
Ralph Wiggum.
Finger up nose if required.
Wear a white kilt, sandals, and a touch of kohl. Tell everybody you are Rameses the Great.
How about a Pirate?
isn’t it obvious?
Pirate!
D’oH!
need to refresh before posting!
Dress up like red licorice.
Rasputin
Rainbow
Rat
Red Rooster (bird or potato- your choice)
Rastafarian
Rihanna
Radio
Rocket
Real Madrid player
Russian
Recession
Rambo
Ringo Star
Royal Wedding
Rapist
Republican
A riddle wrapped in a mystery inside an enigma.
I have no idea what that would look like. (A matryoshka doll, perhaps?)
A while back I saw a MadTV skit featuring Lady Gaga in a refrigerator costume. It might be funny to see a little kid dressed up as a refrigerator.
Of course, I thought “pirate” as well. But you’d need a way to meet the requirements of the assignment, as well as be a smart ass.
Maybe carry a small model paddleboat with you, and claim to be a River Pirate? 
RAM!
T-shirt, possibly a vintage Neal Young type.
Jeans
Black Cowboy Hat
Long wig if you don’t have long hair.
You’re Ronnie Van Zant 
Hawaiian shirt & cowboy hat = Rango.
Raggedy Ann.
Go as Hester Prynne with a big ol’ scarlet (red) letter A on his/her dress.
Go as Scooby-Doo.
To him, Everything starts with “R”
Rhino
Rock
Ring
Ruler
Rapper
Ray Romano
Ranting right-winger
Redrum
Redrum
Redrum
Redrum
Redrum
Redrum
Redrum
Redrum