Since Central Florida is so terribly formal, I suppose that any tee shirt that doesn't offend sensibilities should be acceptable.

Personally, I just don't wear tee shirts as outerwear. Not that you shouldn't, it is just my preference. Polo shirts, and light colorful prints will go well with your solid, but with the tartan, I think I'd stick with solid shirts.

Welcome aboard. What part of Central Florida do you call home?