Sewing is a skill, same as piano, reading and woodworking.
Boys learn the exact same skills as the girls by making the same projects.
There are important sewing skills to be learned that are only found in skirts and dresses. Bust shaping, kick pleats, centered and lapped zippers come to mind. Boys need to learn these skills so they can become a truly capable person at a sewing machine. The main consideration in working with boys at the sewing machine is fabric choice. Choose cars, dinosaurs, small diamond-shapes, random checkerboard prints for Levels 1 and 2.