New Era - MLB Green fitted Cap - New York Yankees League Essential 59FIFTY Dark Green Fitted @ Hatstore | Size: 7 3/8 - (58.7 CM). Color: Green. League: MLB. Team: New York Yankees | Custom caps, hats and beanies from Hatstore. Design your own cap. When you design your own cap at Hatstore, you can choose from various different colours and fronts. You can create products with your logo with no minimum quantity.