Your boys and girls set sail in the direction of their dreams in the Main Sail Collection by Serendipity! The Main Sail Twirl Dress features a whimsical sailboat print in coral and blue, fun pockets, and coral trim. Cross-back style. Elastic back for ease of wear. Cotton/Elastane blend. See Size Guide. xxs(12m-18m),xs(2t-3t),s(4t-5t),m(5-6),l(7-8),xl(9-10),xxl(11-12).