Here is a list I’ve accumulated over time!
Solstice Handmade fungi, arthropods, and various other animals
The Vet Med Artist mostly stickers/prints but they have a hoodie. Ink art exploring veterinary medicine
Laura Wolf Lots of silly bird art (prints through RB)
The Lincoln Forest national park apparel
Fernecreative more prints than apparel but Ferne illustrates (mostly British) wildlife
Coywolf Collections neat zoology art with some furries mixed in
Kelly Ballantyne not sure how much she makes in terms of clothing because her shop is on vacation at the moment, but this artist makes lots of bird illustrations
Moodymoon.co birds, fungi, plants, and other outdoor inspired art!
Mustardbeetle BUGS N BIRDS
Sipseywilder nature apparel of all kinds, bugs, cryptids, birds, plants, etc
Alex Tomlinson cute bird art, lots of art to do with birds and the postal service
Freehand Goods Florian wildlife
Avairia Art cute sea critters
Glitter and Toadstools all sorts of critters
Mothsprout lots of different kinds of critters, some furry stuff mixed in
Pikaloe cute cartoon nature critters, public shop is through rb but if you are a patron you get access to a secret shop
Acorvi art mostly sea critters, cartoony style
Saxony Charlot Hawaiian wildlife I don’t see any apparel yet (though there are some buttons) but I figured I’d share anyway because a portion of profits goes to conservation in Hawaii
Lochnessie the “Birbie” dove design creator, they make lots of cartoony bird art. There aren’t any clothes listed at the moment but they do produce shirts occasionally
One day I would like to make clothing that fits this genre, but I am a full time student and I have a job (among other commitments) so that’s probably not gonna happen soon aha. Also I’m not sure how much I really want to deal with being “marketable.” But I may or may not make my own nature apparel one day :)