H&M Kid's Tiered Poplin Blue Dress. Size 6.

Knee length kid's dress in crisp cotton poplin. Features voluminous flutter sleeves and a square neckline with gathers at the front. Low cut back with an elasticised edge and horizontal elastic strap to hold the dress in place. Seam with covered elastication at the waist and a wide, gathered tier at the hem to create movement. Unlined.