Baseball fans September 15, 2023, is Roberto Clemente day. You can help the Pittsburgh Pirates celebrate Roberto Clemente's contributions to baseball and society by helping to get his number retired. As a baseball fan you can express your support by wearing an "MLB #retire21" t-shirt. This stylish t-shirt is suitable for both men and women. The t-shirt comes in four colors, white, heather true royal, heather prism mint and light blue.