During the Spring of 2019, the Pokemon Company held a competition in Japan that allowed fans to submit their custom design for a New Pokemon T-Shirt. The winner of the this contest submitted a design that contained custom art of both Magikarp and Gyarados, and it was said that this very design would be available for purchase as official Pokemon Merchandise. In addition to this, it was later shared that the winning T-Shirt Design would also be available in Pokemon Sword & Shield for your trainer to wear.
Even though the winner of this competition was later disqualified for submitting a design that they sold previously, it was still confirmed that Trainer Customization will return once again to the Pokemon World within Pokemon Sword & Shield! The winning design will no longer be available within these upcoming games, but players will still be able to personally design what their trainer will look like and wear in Pokemon Sword & Shield!