30+ Creative 100th Day of School Outfit Ideas for Boys

The 100th day of school is a special milestone, and what better way to celebrate than with a fun and creative outfit? Whether you’re looking for a DIY costume, a themed T-shirt, or a historical-inspired look, there are plenty of unique options to make your little one stand out. If you’re searching for 100th day of school outfit ideas for boys, we’ve got you covered with over 30 fantastic suggestions that are easy, creative, and memorable!

30+ 100th Day of School Outfit Ideas for Boys

100 Years Old Grandpa Costume – Dress up as a centenarian with suspenders, glasses, and a cane.

100 Buttons Shirt – Attach 100 colorful buttons to a plain T-shirt for a simple DIY idea.

Superhero with 100 Powers – Create a superhero costume with 100 power stickers or patches.

Dalmatian Puppy (100 Spots) – Wear a white T-shirt with 100 black spots drawn or glued on.

100 LEGO Pieces Outfit – Glue or attach 100 LEGO bricks to a T-shirt or hoodie.

Race Car Driver with 100 Numbers – Decorate a jumpsuit with 100 racing numbers.

Cereal Lover with 100 Pieces of Cereal – Glue 100 pieces of cereal onto a T-shirt.

100 Days Smarter Scholar – Wear a bow tie, suspenders, and glasses with a “100 Days Smarter” sign.

Robot with 100 Bolts – Use foil and cardboard to create a robot costume featuring 100 bolts.

100 Stars Space Explorer – Decorate a T-shirt with 100 gold and silver stars.

100th Day Sports Jersey – Customize a sports jersey with the number 100.

Monster with 100 Eyes – Glue 100 googly eyes onto a monster-themed shirt.

100 Pompoms T-Shirt – Attach 100 colorful pompoms to a T-shirt.

Time Traveler from 100 Years Ago – Dress in old-fashioned clothes from 100 years ago.

Comic Book Character with 100 Words – Design a shirt featuring 100 fun words from comics.

100th Day Scientist – Wear a lab coat with 100 science-themed stickers.

Pirate with 100 Coins – Attach 100 gold coins to a pirate vest.

Superstar with 100 Autographs – Create a celebrity-themed outfit with 100 “autographs.”

100th Day Construction Worker – Wear a vest decorated with 100 small construction stickers.

Dinosaur with 100 Scales – Cut out and attach 100 paper scales to a dino T-shirt.

100th Day King – Dress like a king with a robe covered in 100 jewels.

Space Astronaut with 100 Planets – Decorate a space-themed shirt with 100 tiny planets.

100th Day Police Officer – Create a badge with the number 100 on it.

Firefighter with 100 Flames – Attach or draw 100 flames on a firefighter shirt.

Magician with 100 Tricks – Wear a magician’s cape with 100 stars.

100th Day Farmer with Seeds – Attach 100 real or paper seeds to overalls.

Zookeeper with 100 Animals – Decorate a shirt with 100 small animal stickers.

Teacher with 100 Pencils – Attach 100 mini pencils or printed cutouts to a shirt.

Superhero Cape with 100 Patches – Design a cape featuring 100 superhero-themed patches.

100th Day Emoji Shirt – Print or draw 100 emojis on a T-shirt.

Candy Lover with 100 Wrappers – Attach candy wrappers to a shirt for a sweet look.

Artist with 100 Paint Splatters – Decorate a white shirt with 100 colorful paint splashes.

Weather Forecaster with 100 Raindrops – Glue 100 blue raindrops to a weather-themed outfit.

Musician with 100 Notes – Attach 100 musical notes to a black or white shirt.

These 100th day of school outfit ideas for boys are not only creative but also a great way to celebrate this educational milestone in style! Whether your child prefers a simple T-shirt design or a full costume, these ideas will make the day extra special.