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Adult Dr. Seuss Cat in the Hat Thing 3 Costume

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Please note:

  • Available for pre-order on August 10, 2026 12:00 AM CST.
  • Estimated In-Stock Date: Mid-September
  • Pre-orders are not eligible for discounts.
  • Once you click, you'll have 10 minutes to complete your pre-order.
  • Sorry, pre-orders can't be purchased or shipped with any other items.
  • We'll email you when your full order has shipped!
  • Full payment is required at time of pre-order.
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Item # EL98783AD
Items Included
  • Wig
  • Glasses
  • Jumpsuit
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Product Information

Size Chart
Size Measurement Standard Metric
Small Jumpsuit Chest 39 1/2" 100cm
Small Jumpsuit Sleeve Length 32 1/4" 82cm
Small Jumpsuit Waist 42" 107cm
Small Torso Length 55" 140cm
Small Jumpsuit Inseam 6 1/2" 17cm
Size Measurement Standard Metric
Medium Jumpsuit Chest 43 1/2" 110cm
Medium Jumpsuit Sleeve Length 32 3/4" 83cm
Medium Jumpsuit Waist 46" 117cm
Medium Torso Length 56 1/4" 143cm
Medium Jumpsuit Inseam 6 1/2" 17cm
Size Measurement Standard Metric
Large Jumpsuit Chest 47 1/2" 121cm
Large Jumpsuit Sleeve Length 33 1/4" 84cm
Large Jumpsuit Waist 50" 127cm
Large Torso Length 57 1/2" 146cm
Large Jumpsuit Inseam 6 1/2" 17cm
Size Measurement Standard Metric
X-Large Jumpsuit Chest 51 1/2" 131cm
X-Large Jumpsuit Sleeve Length 33 3/4" 86cm
X-Large Jumpsuit Waist 54" 137cm
X-Large Torso Length 59" 150cm
X-Large Jumpsuit Inseam 6 1/2" 17cm

The Adult Dr. Seuss Cat in the Hat Thing 3 Costume includes a red jumpsuit, blue wig, and mitten, designed for adults who want to complete a group Thing costume or bring Dr. Seuss spirit to reading events and group outings.

The Seuss Costume That Steals the Show

Thing 1 and Thing 2 always get the group chat going. Everyone volunteers. Everyone has a plan. And then someone ends up being Thing 3, which sounds like a consolation prize until you remember that Thing 3 exists in the Dr. Seuss universe as exactly the kind of chaotic good energy every group needs. You are not the backup. You are the expansion pack.

The Adult Dr. Seuss Cat in the Hat Thing 3 Costume is built for teachers celebrating Read Across America, group squads who committed to a theme, and anyone who decided to lean into being the unexpected third. Here is what comes with the whole loud, blue-haired situation.

Design & Details

The red jumpsuit is the centerpiece, and it does the bulk of the identity work. It features a large oval chest graphic with "THING 3" printed in bold black lettering, a high mock neck, and long sleeves. The silhouette is roomy and comfortable, which matters when you're running around spreading Seussian mayhem for several hours.

The look is completed by an electric blue wig that goes absolutely enormous in the best tradition of the source material, plus a red mitten that slips over one hand. The round glasses visible in the product images are not included. Everything else arrives ready to wear straight out of the packaging.

Third Thing, First Out the Door

Picture the school hallway on Read Across America Day. Two colleagues emerge as Thing 1 and Thing 2. Then you round the corner in this jumpsuit, blue wig fully deployed, mitten raised in a greeting that needs no explanation. The kids lose their minds. Your coworkers immediately wish they had called Thing 3 first.

Made By Us
Designer Halloween costumes

We believe that costumes have the power to create some of life's best moments. That's why we started Made by Us. This diverse selection of costumes and accessories are all artfully designed and expertly crafted by our talented team of artists, designers, and developers.

Costume experts designing Halloween costumes

Each project begins with a passion for true quality–embroidered patches, faux fur cut with care, and hand-selected fabrics that are as durable as they are comfortable. Those are just a few examples of how much craft and creativity we put into each and every product. Just for you.

Behind the scenes of exclusive Halloween costume design

No matter how much time it takes, our goal has always remained the same–to create products that inspire your life's best moments–the big, the small, the funny, the spooky, and the sweet. The moments we all cherish. That's Made by Us.

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