If you can't find pink, get white sweats and dye them pink.
Tie a running shoe on top of your head.
You're a wad of bubble gum.
is a tyrannosaurus rex ... top of the head is about 8 feet tall and the tail goes back a good bit.
...to do yard work or take the trash out to freak out the neighbors.
I got the shirt and a penalty book thing for ~$25 on Amazon. Just wear athletic shorts or pants, maybe a sweatband and whistle you have laying around.
Then you get to walk around and give out party fouls to people, show them the yellow (or red) card, and book them.
I mean, it depends what kind of party it is, but I've re-used it a few times and it gets you talking to everyone.
I was a referee from the ND/Michigan game. Referee shirt and stupid block M hat.
coverall suit, like what is used on environmental projects. Glue a bunch of candy wrappers, smashed cans, and other such stuff to it and go as "White Trash." Then you can make all kinds of rude and lewd comments under the pretense of "staying in costume."
You can get them at Grainger supply stores for under $10.
Dress up in Blackface and moonwalk into the party
You can't go wrong