Design and Make Your Own Baseball Uniform. Valkout Apparel is one of China’s leading suppliers of sublimation baseball uniforms, and we provide low-cost custom baseball uniforms of high quality. All of our custom sublimation baseball uniforms are printed precisely to your specifications using sublimation. We have designers for sublimation baseball jerseys who can make you custom baseball uniforms. You can send us images of your custom baseball uniforms or sublimation baseball designs; our designer will handle your designs until you approve them.