This is an old pattern - listed as 'new' because the inside instructions and patterns have not been used nor  opened --  the envejope shows signs of being filed or moved around --

This vintage McCall's pattern number 3496, offers a charming sailor-style top, pants, shorts, and dress for girls or boys in size 5. The pattern is from the United States and is an original, not a reproduction. It is perfect for  anyone who enjoys sewing and creating unique and stylish clothing for children. Pattern is recommended for knits.  The pattern set includes all the necessary pieces to create a lovely sailor-style outfit for a child, including a top, pants, shorts, or dress. The brand is McCall's, a trusted name in pattern sets for sewing enthusiasts. This item falls under the categories of Children, Patterns, Sewing (1930-Now), and Collectibles.