I don't know about you but my 3 year old doesn't exercise much but if yours wants to look like her then these shirts are for her. It's a strange, thin, sticky material, similar to Lycra. It's not my favorite on her and it doesn't feel like a high quality fabric, but she says it's comfortable and she loves the look.
UNACOO 2 Pack Sleeveless Cotton Dresses Girls' Clothing
62 Review
Rainbow Toddler Princess Sleeveless Sundress Girls' Clothing and Dresses
57 Review
Amazon Brand Sleeveless Unicorns Metallic Girls' Clothing in Dresses
75 Review
Castle Fairy Pageant Wedding Communion Girls' Clothing for Dresses
53 Review