SpiritWeekHQ
School Spirit

100th Day of School Costume Ideas for Kids

Everything you need for 100th day of school — outfit ideas, budget picks, and DIY tips.

Top Picks for 100th Day of School

We earn a small commission if you shop through the links below — at no extra cost to you.

Popular Variations

Old LadyOld Man100 Items Shirt

Quick DIY Tips

  • Dress your child as a 100-year-old with a bathrobe, slippers, and baby powder in the hair.
  • Glue 100 small items (stickers, googly eyes, buttons) onto a plain t-shirt.
  • Draw wrinkles with eyeliner and use a cane or walker prop for the full effect.
  • Write '100' on a shirt and tape 100 things (cereal pieces, pom poms) to it.

Full guide coming soon!

A detailed outfit breakdown, budget tiers, and parent pro tips are on the way. In the meantime, use the planner to find 100th day of school costumes on Amazon.

Shop 100th Day of School Costumes

Planning Spirit Week?

Create a free, printable flyer with 100th Day of School and your other theme days in under 2 minutes.

Create a Free Flyer →

Other Popular Themes

As an Amazon Associate, SpiritWeekHQ earns from qualifying purchases.