9 Easy 100th Day of School Costume Ideas (Kids Love #3)

ByCostume Team

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The flyer came home: “Dress like you’re 100 years old!” or “Wear a shirt with 100 things on it!” And it’s due Friday.

Every idea here comes together with stuff from home or a dollar store, and nothing will fall apart by recess. Most take less than half an hour.

Jump to a Costume

  1. Old Lady (Grandma at 100)
  2. Old Man (Grandpa at 100)
  3. The 100 Things Shirt
  4. Zero to Hero
  5. Caveman (Way Older Than 100)
  6. Mummy (5,000 Years Old)
  7. Ebenezer Scrooge
  8. Garden Gnome
  9. Wizard

1. Old Lady (Grandma at 100)

Illustration of an old lady costume: a smiling girl dressed as a 100-year-old grandma with a gray bun, glasses on a beaded chain, a lavender cardigan over a floral dress, a shawl, pearls and slippers, leaning on a cane.

The classic. Gray hair, glasses and a cardigan make the most popular 100-year-old costume there is.

How to do it: Gray hair spray, a bun with a hairnet, glasses on a chain, a cardigan over a dress, a shawl and pearls. Add a cane and slippers. About 15 minutes.

Worth buying: an old lady costume kit.

2. Old Man (Grandpa at 100)

Suspenders and a sweater vest are the fastest way to age 90 years.

How to do it: Gray hair spray, glasses, a sweater vest over a button-down, pants pulled up high with suspenders, a flat cap or bow tie, and a cane. Draw on bushy gray eyebrows. About 15 minutes.

Worth buying: an old man costume kit.

3. The 100 Things Shirt

Kids love making this one. A plain T-shirt covered in exactly 100 of something.

How to do it: Glue or pin 100 small items to a plain tee: pom-poms, googly eyes, stickers, buttons or candy wrappers. Group them in tens so it’s easy to count. Add “100 Days Smarter” in fabric marker. About 45 minutes.

Worth buying: a bulk pack of googly eyes.

4. Zero to Hero

Illustration of an original superhero costume: a person in a deep teal bodysuit with gold boots, gold gloves and a gold belt, a knee-length gold cape, a simple teal eye mask, and a gold lightning-bolt emblem on the chest, hands on hips.

A superhero with a “100” emblem on the chest is a clever twist that kids love.

How to do it: Solid-color top, a towel or felt cape, and a big “100” cut from felt as the emblem. Call yourself Captain 100. About 20 minutes.

Worth buying: a kids’ cape and mask set.

5. Caveman (Way Older Than 100)

Illustration of a caveman costume: a bearded man with wild hair and a bone in it, wearing a ragged one-shoulder leopard-print fur tunic tied with rope and fur boot covers, holding a knobby club over his shoulder.

Why stop at 100? A caveman is about 10,000 years old, and that’s the joke.

How to do it: Faux fur tunic over one shoulder, rope belt, messy hair and a foam club. Pin a sign: “I’m 10,000 days old.” About 15 minutes.

Worth buying: a foam caveman club.

6. Mummy (5,000 Years Old)

Illustration of a mummy costume: a figure wrapped head to toe in tea-stained, yellowed linen strips with loose trailing ends, dark eyes peeking out between the wraps, arms slightly outstretched.

Same joke, spookier. A mummy works great if your school allows it.

How to do it: White long-sleeve shirt and leggings wrapped with gauze or white fabric strips. Leave the face open. About 20 minutes.

Worth buying: costume gauze wrap.

7. Ebenezer Scrooge

Illustration of an Ebenezer Scrooge costume: a thin scowling old man with round spectacles, a long gray nightshirt under a faded brown dressing gown, a tasseled nightcap and slippers, holding a lit candle.

A classic old man from literature. Scrooge is perfect for older kids and teachers.

How to do it: Robe or dark coat, nightcap, round spectacles, gray hair and a candle prop. Grumble about the cost of everything. About 15 minutes.

Worth buying: a nightcap.

8. Garden Gnome

Illustration of a garden gnome costume: a jolly man with a big round fluffy white beard, rosy cheeks and nose, a tall stiff pointed red felt hat, a blue long-sleeve shirt, a wide brown belt with a large brass buckle, brown trousers tucked into brown boots, holding a small garden shovel.

Gnomes always look about 100. A garden gnome is cute and easy for little ones.

How to do it: Tall red hat, cotton-ball or fake white beard, blue shirt, brown belt and boots. Rosy cheeks. About 15 minutes.

Worth buying: a gnome hat and beard set.

9. Wizard

Illustration of a classic storybook wizard costume: an old man with a long flowing white beard to mid-chest, a floor-length midnight-blue robe with wide sleeves embroidered with small silver stars and crescent moons, a tall pointed blue hat with a wide brim, holding a tall gnarled wooden staff with a glowing crystal at the top.

A long white beard and a robe make a 100-year-old wizard with no aging makeup at all.

How to do it: Robe or bathrobe, pointed hat, long white beard and a staff. Carry a “spell book” titled 100 Spells. About 15 minutes.

Worth buying: a kids’ wizard hat and beard.

Tips for 100th Day Costumes

Check the flyer. Some schools want the 100-year-old look, others want 100 items. A few let kids choose.

Keep makeup light. Gray hair and glasses do most of the aging, and heavy wrinkles smudge by lunchtime.

Use the dollar store. Canes, glasses, hair spray and pom-poms are all there for a few dollars each.

Browse every costume tagged for the 100th Day of School, or see the full costume encyclopedia from A to Z.

100th Day of School Costume FAQ

What do kids wear on the 100th day of school?

Most dress like they’re 100 years old (gray hair, glasses, cardigan and cane) or wear a shirt decorated with 100 things.

How do I make a 100th day shirt?

Glue or pin 100 small items like pom-poms, googly eyes or stickers onto a plain tee, grouped in tens for easy counting.

How can I make my child look 100 years old?

Gray hair spray, glasses, a cardigan or sweater vest, a cane, slippers and a few soft eyeliner wrinkles.

When is the 100th day of school?

It depends on your school’s start date, but it usually lands in late January or February.

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