I wear either a long-sleeved shirt or a 15-year-old T-shirt. I like blues and green but also wear reds and oranges. I don't wear yellow. Plaid and/or collared shirts are fine too, but I always button all the buttons.
I never wear jeans. I wear shorts or slacks or pedal-pushers. Green, lavender, blue, etc. Then in the winter I wear a hat and coat.