- Age 5-7 - $53.99
- Age 8-9 - $53.99
- Age 10-11 - $53.99
Kids Superhero in Undies Costume - Comic Book Hero Muscle Suit
DELIVERY
- Dispatch: Within 24 Hours
- Registered & Express Post for ALL Orders.
- Pick up is available.
- Easy 14 days returns and exchanges
RETURNS
If you do not like the product you can return it within 14 days - no questions asked. This excludes stockings, gloves, swimwear and clearance sale items. We have an easy and hassle-free return policy. Please look at our Delivery & Returns section for further information.
PRODUCT DETAILS
What's in the Box
- Peach muscle jumpsuit with foam padding in chest, arms & legs
- White high-waisted briefs attached
- Red polka-dot satin cape with scalloped hem
- Red fabric neck tie
- Latex bald head cap
This Kids Superhero in Undies Costume turns Book Week morning into a guaranteed laugh — foam-padded muscle suit, white briefs on the outside, and a red polka-dot cape that billows behind your kid like a comic book cover. The latex bald cap completes the look for any young superhero who fights crime in his underwear.
The peach bodysuit has built-in foam muscles through the torso, arms and thighs for that exaggerated superhero silhouette. White briefs sit high on the waist (permanently attached, no wardrobe malfunctions), and the red satin cape ties at the neck with a matching fabric tie. Stretchy comfortable wear — goes on over a long-sleeve top if the classroom's cold.
Perfect For
Book Week & Literature Days: A natural pick for the Captain Underpants book series, Dav Pilkey character parades, or any "favourite book hero" dress-up day at school.
School Costume Days: Works for 100 days of school dress-up (the "underwear superhero" is a classic school joke), Dreamworks character days, or end-of-term costume parties where kids want something funny.
Halloween & Parties: Perfect for trick-or-treating, birthday parties with a superhero theme, or any event where your kid wants to be the class clown in the best way possible.
How to Wear It
Pair with black school shoes or sneakers (not included) and the bald cap stretched over your child's hair. Skip the shirt underneath unless it's genuinely cold — the muscle padding works best against skin tone or a plain white tee.
Parent FAQs
What size should I order?
Check the size chart image on this listing — measure your child's chest and height, then match to the closest size. The foam padding adds bulk, so if they're between sizes we'd say stick with their usual size rather than sizing up.
Can they wear this over regular clothes?
The jumpsuit can go over a long-sleeve top and leggings if needed, though the muscle padding looks best without bulk underneath. The bald cap works over short or tied-back hair.
How do I wash this? Is the foam durable?
Spot-clean the foam sections with a damp cloth, hand-wash the cape separately. The foam holds its shape well through a school day but shouldn't go in the machine. The bald cap wipes clean with a baby wipe.
Is this suitable for outdoor Book Week parades?
Yes — the cape is lightweight enough not to snag, and the bald cap stays put with a bit of double-sided tape at the temples if it's windy. Just remind them the cape isn't for actual flying.
Care: Spot-clean bodysuit, hand-wash cape, wipe latex cap clean.
SHIPPING & RETURNS
Returns Policy
We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at sales@kidsbookweekcostumes.com.au.
If your return is accepted, we’ll send you a return form, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Shipping
We offer Flat Rates $9.8 for Registered Post or $14.8 for Express Post within Australia.



