Custom Fishing Jersey Supplier Build Custom Jersey. Custom fishing shirts are made by Valkout Apparel using the dye sublimation printing method, in which imported heat-sensitive ink is applied to the fabric and dyes it permanently. After being printed on sublimation paper, the inks are applied to the fabric using a heat press. After that, the ink is permanently incorporated into the fabric’s weave. We typically referred to the fishing shirts as sublimated fishing shirts, custom fishing shirts, or sublimation fishing shirts.