Which outfit should i try?

I feel like a NPC sometimes for using too basic and low profile clothes. When i was a teenager i wore a lot of different t-shirts of movies and TV shows i liked, such as Star Wars , Lord of the Rings and Breaking Bad. They were cool, but now as an adult it would be terrible, because it would give me a loser style. That's why i started dressing like "an adult", with more basic clothes, . If it's a more formal occasion , like a dinner or a date, i wear a shirt ( green,blue or brown, my favorite colors), jeans and tennis shoes. To sporty events, like gym or a walk, i wear some random t-shirt i get and shorts. But is basic af, and i would like to get a "style" . The problem is, i live in a tropical country, it is not comfortable to wear coates or long-sleeved clothes. I also feel strange on more sophisticated clothes, i feel like a " scarecrow in good circumstances" like Charles Dickens said.