Pokémon Shirts, an online shirt service that allows consumers to mix and match prints created based on the first 151 Pokémon to create their own unique shirts, was created by Original Stitch and The Pokémon Company and was launched on Pokémon Day, February 27, 2019 in Japan. Since then, it has expanded to the following regions: Hong Kong, Taiwan, Singapore, Malaysia, Philippines, India, Indonesia and more recently, the United States. Due to ongoing and overwhelming requests from fans around the world, Pokémon Shirts will be available for enjoyment in eight additional regions: the UK, France, Italy, Spain, Germany, Canada, Australia, and New Zealand starting December 16, 2019.
The fans can go to them www.pokemon.co.jp/ex/shirts/en/
Pokémon shirts can be purchased in 6 styles: dress shirt, Casual Shirt, and Hawaiian Shirt, each in the form of a men's shirt.
Source: Company Pokemon