I purchased this in size 6-7 years for my 6 year old granddaughter. She's average size. This runs just a little bit loose on her. But she'll be growing through the summer, I'm sure. The length is good, it's just a little bit wide. It's very lightweight, a light cotton fabric. Almost sheer, but still opaque enough that undies won't show through. The design is bright and fun, exactly as pictured. All seams and hems are done very well, quality construction. Adorable on.