Looking for the best 100th day school costumes? We’ve got you covered with 10 fun and creative ideas to make this milestone celebration unforgettable!
The 100th day of school is a special milestone for kids. It’s a time to celebrate learning and growth. Dressing up adds extra fun to the day.
Costumes make this event memorable. Kids love transforming into fun characters. It sparks creativity and laughter.
We’ve found the best costumes for this big day. From old lady to old man outfits, there’s something for everyone. Let’s make this celebration unforgettable!
List of Top 10 100th Day School Costumes
| Image | Title | Best For | Price |
|---|---|---|---|
![]() |
SOMSOC 13 Pcs Old Lady Costume for Kids Girls 100th Day of School Grandma Costume Granny Dress with Shawl Wig for Cosplay |
This SOMSOC 13 Pcs Old Lady Costume is perfect for kids girls who want to dress up as a grandma for school events like the 100th Day of School. It’s also great for classroom activities, themed photo sessions, or any fun dress-up occasion. |
|
![]() |
CONNICS Kids 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy,Grandpa Costume For Kids |
This costume is perfect for kids who want to dress up as an old man for the 100th day of school or any fun event. It’s great for boys and girls from toddlers to big kids, offering easy and hilarious fun. |
|
![]() |
choyaxo Old Lady Costume 100th Day of School Costume Accessories Dress Up |
This costume set is perfect for anyone who wants to dress up as an old lady. It’s great for school events, photo shoots, or creative play. |
|
![]() |
CONNICS 100 days of school costume for Kids, 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy, Grandpa Costume For Kids |
This costume is perfect for kids who want to dress up as an old man for school events or parties. It’s easy to wear and fun for all ages. |
|
![]() |
qnprt 100 Days of School Costume 100th Old Lady Costume for Kids Girls Grandma Dress Up,6 |
This costume is perfect for kids who love to dress up. It’s great for school events, parties, or playtime at home. |
|
![]() |
EBYTOP Old Lady Costume for Kids 100 Days of School Costume for Girls 100th Day Grandma Dress Up,Set1 |
This costume is perfect for kids who want to dress up as an old lady. It’s great for school events or fun parties. |
|
![]() |
SYNLETT Light-up Fake Life Alert Button Prop 100th Day of School Costume, Fun Emergency Call Button |
This fun prop is perfect for kids celebrating their 100th Day of School. It’s a great addition to their costume and adds a playful touch to the day. |
|
![]() |
Boutrele 100 Days of School Costume for Boys Kids,Old Man Costume for Kids Boys,Grandpa Costumes Accessories Set |
This costume set is perfect for kids aged 3 to 12 who want to celebrate 100 days of school in a fun and creative way. It’s also great for school parties, photo shoots, or any event where kids can dress up as an old man and bring smiles to everyone. |
|
![]() |
ZeroShop Old Man Costume for Kids, Hats with Shirts 100th Day of School Grandpa Old Person Dress Up Outfit for Boy -6 |
This old man costume is perfect for kids who want to dress up for a school event or party. It’s great for boys who love fun outfits and want to stand out. |
|
![]() |
Aimeiar Kids 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy,Grandpa Costume For Kids |
This costume set is perfect for boys celebrating their 100th day of school. It’s also great for school plays or dress-up parties. |
Detailed Reviews
Discover the top 10 100th Day School Costumes in our expert-curated guide. Each pick is chosen for comfort, fun, and value, ensuring your child stands out. From granny dresses to grandpa accessories, find the perfect fit for a memorable celebration.
1. SOMSOC 13 Pcs Old Lady Costume for Kids Girls 100th Day of School Grandma Costume Granny Dress with Shawl Wig for Cosplay

The SOMSOC 13-piece old lady costume is perfect for kids celebrating the 100th day of school. It includes everything needed to transform into a granny, from a floral dress to a wig and accessories.
Made from soft, durable fabric, this costume is comfortable and long-lasting. It’s great for school events and even everyday wear, making it a versatile choice.
Easy to use, fun to wear, and packed with details. Perfect for creative dress-up and memorable moments.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This SOMSOC 13 Pcs Old Lady Costume is perfect for kids girls who want to dress up as a grandma for school events like the 100th Day of School. It’s also great for classroom activities, themed photo sessions, or any fun dress-up occasion.
Ready to Purchase?
2. CONNICS Kids 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy,Grandpa Costume For Kids

Transform your child into a hilarious 100-year-old with this complete costume kit. It includes everything needed for a fun and easy makeover.
Perfect for the 100th day of school or any dress-up event, this set fits kids from toddlers to big kids. The lightweight hat ensures all-day comfort.
Durable and reusable, this costume offers great value. Kids will love wearing it again and again.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume is perfect for kids who want to dress up as an old man for the 100th day of school or any fun event. It’s great for boys and girls from toddlers to big kids, offering easy and hilarious fun.
Ready to Purchase?
3. choyaxo Old Lady Costume 100th Day of School Costume Accessories Dress Up

The choyaxo Old Lady Costume is a fun dress-up set perfect for any event. It includes a wig, glasses, inflatable cane, shawl, and more, all designed for adults.
This set is easy to use and versatile. Wear items together or separately for different looks. Great for school plays, photos, or creative fun.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume set is perfect for anyone who wants to dress up as an old lady. It’s great for school events, photo shoots, or creative play.
Ready to Purchase?
4. CONNICS 100 days of school costume for Kids, 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy, Grandpa Costume For Kids

The CONNICS 100 Days of School Costume is a complete set for kids. It turns them into an adorable old man in no time!
Includes suspenders, glasses, bow tie, and fake facial hair. All pieces are easy to wear and adjustable. Perfect for school events or parties.
Made with soft, safe materials for all-day comfort. Kids can move and play without fuss. Creates fun, lasting memories for everyone!
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume is perfect for kids who want to dress up as an old man for school events or parties. It’s easy to wear and fun for all ages.
Ready to Purchase?
5. qnprt 100 Days of School Costume 100th Old Lady Costume for Kids Girls Grandma Dress Up,6

Celebrate 100 days of school with this fun old lady costume for kids. It’s perfect for girls who want to dress up as a grandma. The set includes everything needed for a complete look.
The high-quality fabric makes the dress comfortable and durable. Kids can wear it for everyday use, not just for special events. It’s a versatile addition to any wardrobe.
This costume is great for school events and themed parties. It also encourages imaginative play at home. Kids will love transforming into an adorable grandma!
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume is perfect for kids who love to dress up. It’s great for school events, parties, or playtime at home.
Ready to Purchase?
6. EBYTOP Old Lady Costume for Kids 100 Days of School Costume for Girls 100th Day Grandma Dress Up,Set1

This 100 Days of School Costume is perfect for kids. It includes everything needed for a fun look. Your child will love dressing up.
The set has a wig, shawl, glasses, and more. It’s soft and comfy to wear. Kids can move and play easily.
It’s great for parties or school events. The quality is top-notch. You’ll love the results.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume is perfect for kids who want to dress up as an old lady. It’s great for school events or fun parties.
Ready to Purchase?
7. SYNLETT Light-up Fake Life Alert Button Prop 100th Day of School Costume, Fun Emergency Call Button

This fun prop is perfect for the 100th Day of School. It’s a light-up fake life alert button that adds a playful touch to any outfit. Kids will love the realistic design and bright red light.
The necklace has a 19.7-inch drop and an adjustable lanyard. It comes with a battery included, so it’s ready to use right away.
This gag button is just for fun and not a real alert system. It’s a great accessory for school events or creative play.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This fun prop is perfect for kids celebrating their 100th Day of School. It’s a great addition to their costume and adds a playful touch to the day.
Ready to Purchase?
8. Boutrele 100 Days of School Costume for Boys Kids,Old Man Costume for Kids Boys,Grandpa Costumes Accessories Set

The Boutrele 100 Days of School Costume turns kids into realistic old men. It includes 10 fun accessories like a hat, cane, and glasses. Perfect for creative dress-up and celebrations.
The one-size-fits-all design works for kids aged 3 to 12. All items are lightweight and durable, great for daily use or parties. The cane even adjusts to 5 heights for a perfect fit.
This costume is ideal for school events or family fun. It brings smiles and laughter to any occasion. Make memorable moments with this complete set.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume set is perfect for kids aged 3 to 12 who want to celebrate 100 days of school in a fun and creative way. It’s also great for school parties, photo shoots, or any event where kids can dress up as an old man and bring smiles to everyone.
Ready to Purchase?
9. ZeroShop Old Man Costume for Kids, Hats with Shirts 100th Day of School Grandpa Old Person Dress Up Outfit for Boy -6

This 10-piece old man costume is perfect for kids. It includes everything from a vest to grandpa socks. Kids can dress up as a fun, eccentric old man.
The shirt, pants, and vest are made of soft cotton. They are comfortable to wear all day. Kids will stand out at any school event.
This set is great for school plays or themed parties. It’s easy to wear and lots of fun. Kids will love the glasses, cane, and mustache too.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This old man costume is perfect for kids who want to dress up for a school event or party. It’s great for boys who love fun outfits and want to stand out.
Ready to Purchase?
10. Aimeiar Kids 100th day of school costume for Boys, Old man dress up for kid, Old person costume For Boy,Grandpa Costume For Kids

Celebrate your child’s 100th day of school with this fun old man costume! It’s perfect for boys to dress up and have a great time.
The set includes everything needed: a hat, glasses, moustache, cane, bow tie, and suspenders. It’s easy to wear and fits all kids.
| Pros | Cons |
|---|---|
|
|
Perfect For:
This costume set is perfect for boys celebrating their 100th day of school. It’s also great for school plays or dress-up parties.
Ready to Purchase?
Buying Guide
The 100th day of school is a special milestone for kids. Dressing up makes it even more fun!
Choosing the perfect costume can create memorable moments. Here’s what to consider:
- Comfort: Look for soft, durable fabrics that kids can wear all day without fuss.
- Completeness: Pick sets with all accessories included for a ready-to-wear look.
- Size: Ensure the costume fits well, with adjustable options for growing kids.
- Versatility: Choose outfits that work for school events and everyday play.
- Durability: Go for high-quality materials that last through multiple uses.
- Creativity: Select costumes that spark imagination and laughter.
- Safety: Check for safe, non-toxic materials and avoid choking hazards.
- Ease of Use: Opt for costumes that are easy to put on and remove.
With these tips, you’ll find the best costume for an unforgettable celebration!