Amazon.com: ADA TWIST, Scientist Dress-Up Set, Size 4-6X, Includes Experiment Card and 5 Costume Accessories, Kids Toys for Ages 3 Up, Gifts and Presents : Toys & Games
Scientist Costume Set | A Mighty Girl
How to Make a Kid's Scientist Halloween Costume
California Costumes Lil' Scientist/inventor Toddler Costume, Medium (3-4) : Target