Vintage 1960's Butterick Young Junior Swim Suit / Cover-Up Pattern Size 12. Pattern #3131. Swimsuit features a cute little Halter Style Top with a high front neckline and a scooped back that has a one-button closure. The bottoms are brief style with front darts and back darts and a back zipper. The cover-up has set in sleeves and a hood. It is a button front closing. Pattern sleeve is torn at the top and side Pattern contains 15 pieces. Pattern appears to be complete and uncut.