I ordered Sz Small for my 5 year old. It's roomy, which is what I expected as she usually wears a size XS. I erred on the plus side to make sure it would fit. I didn't want a tight sweatshirt dress. This is probably pretty close to the exact size. This is now classed as a dress and while it is actually longer than a standard sweatshirt I would consider it more of a tunic than a dress. The length seems like a decent dress length for my daughter who is 3.5ft but keep in mind this is a size larger than she normally wears. It will look shorter on her once it fits her better. Whatever you call it, it's still cute and pairs well with leggings.
Amazon Brand Sleeveless Unicorns Metallic Girls' Clothing in Dresses
75 Review
Rainbow Toddler Princess Sleeveless Sundress Girls' Clothing and Dresses
57 Review
Fancy Girls Communion Dresses White Girls' Clothing in Dresses
53 Review
Castle Fairy Communion Pageant Bridesmaid Girls' Clothing for Dresses
54 Review
Eocom Pairs Childrens Winter Animal Girls' Clothing
64 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review