Niantic has announced that the Gym Challenger Uniform and the Dragon and Dark-type Sport Outfits are now available in the Pokémon GO shop. The Gym Challenger Uniform avatar outfit are free for all players.

Pokémon GO - Gym Challenger Uniform / Dragon and Dark-type Sport Outfits

Uniforms that appear in the Galar region are now available as avatar items in Pokémon GO! Pick up the Gym Challenger Uniform avatar item for free, which is worn by Pokémon Trainers challenging Gyms in the Galar region.

Shop Items

Dragon-type Sport Top - 150 coins
Dark-type Sport Top - 150 coins
Challenger Kit Sport Top - Free
Dark-type Sport Legwear - 100 coins
Challenger Kit Sport Shorts - Free
Dragon-type Sport Shorts - 100 coins

Source: https://twitter.com/PokemonGoApp/status/1429986822898298880