For many kids, "100" is a huge milestone! While districts mark the 100th day on different dates (often late January or February), the vibe is the same: classrooms decked out, themed activities, and a big dress-up moment. If your student wants a 100 days of school outfit, we've got easy wins from classic centenarian looks to teacher-approved, classroom-friendly costumes, accessories, and DIY ideas to make the moment photo-worthy. Check out this curated collection and get to celebrating!
100-Year-Old Lady Costumes for Girls
Girls' 100 Days of School Costumes
The beloved centenarian costume is an instant crowd-pleaser. Think floral dress, cozy cardigan, pearls, and sensible "grandma" shoes. Our girls' grandma costumes simplify the build with pieces like housecoats, shawls, and gray wigs. Add round spectacles, chunky "heirloom" jewelry, and a toy walking cane for the full effect. DIY fans can make a PVC "walker" with tennis balls, or pop in foam curlers and slip on fuzzy slippers for a comfy, classroom-safe twist.
100-Year-Old Man Costumes for Boys
For an "old man" transformation, start with bow tie, suspenders, plaid shirt, and a flat driver's cap. Our boys' grandpa costumes pack the essentials; a kids' old-age kit adds a wig, mustache, and glasses in one go. Consider a sweater vest over a button-down and swap a real cane for a lightweight prop cane to keep hallways safe. Bonus points for a pocket watch and a pocket-sized "back in my day" notepad for hilarious quotes.
100 Days of School Costume Accessories
100 Days of School Accessories
If you're piecing it together, accessories make the outfit: canes, suspenders, prop anti-drop reading glasses, vintage frames, pearls, brooches, shawls, wristwatch chains, and grey wigs. For shirts, iron-on or stick 100 pom-poms, googly eyes, or stickers to a plain tee ("100 Days Brighter," "100 Days Smarter"). Add number balloons, bead necklaces, or a 100-punch card lanyard for hallway flair without fuss.
School and Read-Across-America Costumes
| Read Across America Costumes | School Supplies Costumes |
Maybe your child wants to dress up for the 100th day of school, but isn't so keen on dressing up in an old person costume. Perhaps they are eager to wear a funny costume for spirit week. Whatever the case, we have some silly school outfits that are perfect for a classroom setting. Your child can dress like the coolest teacher of all time in a Miss Frizzle costume, or be their favorite colored crayon. Perhaps they are all about that cool dude, Pete the Cat, the biggest floof, Clifford the Big Red Dog, or all about Dr. Seuss characters. No matter their ambitions, your child will make their teacher's day.
Whether your child goes full "100-year-old" or rocks a book-character or classroom-supply look, the 100th day of school is about celebrating growth with creativity and comfort. Build it from a ready-to-wear costume, add a few 100 days accessories, or DIY a tee covered in "100s." When you're ready to outfit the whole class calendar for Read Across America, spirit week, biography day, or STEM night, HalloweenCostumes.com has the kids' costume categories and accessories to make school memories picture-perfect!
