I am thinking of wearing a "hooters" t-shirt that someone left at my house
and some cheapish pants or skirt from an op-shop.

Bimbo zombie.

The feminist undercurrents appeal to me.

Can you think of something cooler though?

you should wear the entrails of an onlooker.

My sister and her fiance once planned to go as Zombie Supply sellers - I couldn't remember if they were trying to "sell" supplies for the humands or for the zombies. Pretty funny though.

Get any old lopsided skirt that you might have (too big too small, too gaudy) that you can rip at the bottom, and add ripped opaque pantyhose to that. Careful to (clear) nailpolish the "rip" ends so that these runs stop getting larger. You'll only need to blood/gore makeup the part of your legs that is showing through (knee's maybe), and score extra points for authenticity! (alternative, rip some old jeans and do the same).

Also, the hooters T-shirt is a riot especially if you can rip it and have a plastic gore-made-up poking through! Bimbos WILL get bit first! disclaimer: not saying all hooter-working-gals are bimbos, but I see the bimbo thing you're going for

It's all about the blood/gore showing through!

A Playboy bunny outfit would be hilarious - and you'll have full legs to play the rip-pantyhose game on. Might be tough covering your full arms though.

plastic gore-made-up tit poking through. Man I lost the most important word. And I don't mean the bird.

I mean the joke-shop kind, by the way. Like these.

I went to a movie-themed fancy dress party once as Stacy - school uniform, pigtails, a (toy) chainsaw and lots and lots of blood. The makeup is pretty easy, too.