Book Week Costumes Under $20: Easy Ideas Using Things You Already Own

Book Week has a way of sneaking up, usually the night before the parade when you realise there is no costume. Before you rush out and spend big, here is the good news: the best Book Week costumes are almost always built from things you already own, plus one clever prop. Here is how to pull it off for under $20, with real character ideas to copy.

The cupboard-first costume rule

Open the wardrobe before you open your wallet. Nearly every classic book character can be built from clothes you already have, a school uniform, a striped top, all black, pyjamas. Start with what is there, and you only spend on the one detail that brings the character to life.

How to make a character recognisable

A costume works when people can name the character at a glance. You usually only need one strong signal: a single colour, a prop, a hairstyle, or a printed copy of the book's cover pinned on or carried. Harry Potter is a school uniform plus round glasses and a wand. Wally is a striped top plus a beanie. Nail that one thing and the rest can be ordinary clothes.

Ten costume ideas under $20

Grouped by what is probably already in the house:

• School uniform: Harry Potter or Hermione Granger, with a tie, round glasses and a cardboard wand. Or Matilda, with a hair ribbon and a stack of books under one arm.
• Striped clothing: Wally from Where's Wally, in a red and white striped top, beanie and glasses. Or Pippi Longstocking, with striped socks and plaited hair sticking out sideways.
• Black clothing: the witch from Room on the Broom, with a pointy hat and a cardboard broom. Or Mog the cat from Meg and Mog, with paper ears and a tail.
• Pyjamas or a onesie: Max from Where the Wild Things Are, with a paper crown and ears. Or the Very Hungry Caterpillar in anything green.
• Overalls: the hungry farmer from Wombat Stew, or Fern from Charlotte's Web carrying a toy pig.
• Everyday clothes plus one prop: the Cat in the Hat with a red bow tie and a tall striped hat, Willy Wonka with a jacket and a walking cane, or Dorothy from The Wizard of Oz in a blue checked dress and red shoes.
• A decorated cardboard box: the Iron Man from Ted Hughes' story as a painted box robot, or the Gruffalo in brown clothes with cardboard horns and claws.

Five-minute cardboard props

A cereal box and a marker go a long way, and the prop often does more to sell a costume than the clothes. Cut and colour a wand for Harry Potter, a paper crown for Max, a broom for the Room on the Broom witch, the Gruffalo's horns and claws, or a pair of round glasses for Wally. All of it comes from the recycling.

Ideas connected to Symphony of Stories

The 2026 Children's Book Week theme is Symphony of Stories, which opens the door to music and story mash-ups. Think the Pied Piper of Hamelin with a cardboard flute, one of the Bremen Town Musicians, or a favourite character holding a homemade guitar or a chopstick conductor's baton. It is a great prompt for kids to pair a book they love with something musical.

Costume swaps and second-hand options

Before buying anything, ask around. A quick swap with another family, a look through the op shop, or borrowing a single item can cover the gap for nothing or next to nothing. Costumes are worn once, so second-hand is the smart play.

A night-before emergency costume

Caught out? All black plus cardboard ears makes an instant Mog the cat, and everyday clothes plus a printed book cover worn as a sign works for any story at all. Recognisable beats elaborate every time.

Safety and school-rule checklist

Before the big day, check the costume lets your child see, walk and sit comfortably, skip anything with a mask that blocks vision or a prop that could be a hazard, and confirm your school's rules on props and face paint. Any character from a book your child loves works, so let them pick. For more low-cost family ideas, see our affordable school holiday activities and cheap hobbies to try in 2026.

Choose the outfit first, then spend only on the single item that makes the character identifiable. Your budget, and your night before, will thank you.