Depends
Conservative, I usually wear Cherokee single color shirts. They don't stretch, are tag less, and heavy but breathable. Plus you can wash them a bunch and they don't fade all that much.
If I wanna be all flashy I'll wear something with print on it that doesn't cost a fortune but doesn't come from target.
On the real though I'm way more into suits and dress clothes then I am t-shirts and jeans. I guess it's fitting since I'm turning 30 but finding nice hard sole dress shoes and a decent ties seems more appealing to me. Maybe I've turned a page.