Jolyn Jackson 4 Swim Onesie Limited Edition Print Tropix (Sold out Online) Size 32 NWT, never worn One of our most classic and bestselling styles, the Jackson training one piece swimsuit is comfortable and stylish. The rounded neckline shape stays nice and flat when in streamline and the medium / full bum coverage keeps you covered while you're moving. The Jackson's adjustable tie-straps give you the perfect fit for the moment—loose for comfort or snug for speed.