Somewhere over the rainbow bluebirds fly! The Bluebird Collection by Serendipity is comfy and cute in soft, cotton knit and blue and white gingham. The Bluebird Shorts are a classic style for boys. Features an elastic waist with tie and fun pockets. Cotton/Elastane blend. See Size Guide. xs(2t-3t),s(4t-5t),m(5-6),l(7-8),xl(9-10).