I just wear what I want and my beliefs are evident with those I talk to. Plus I’m not a fan of wearing t-shirts.

I have several t-shirts that suggest that I reject the idea of a deity. I wear them selectively; I wouldn't wear my Flying Spaghetti Monster (FSM) shirt to a funeral, for instance.
Mostly, the shirts would only be offensive if the person already knew what they represented. For the most part, the shirts would go unnoticed or passed off as just another novelty tee.
If someone were to ask about the shirt, I would have no issues discussing it.
If someone expressed that they were offended by my shirt, I would suggest that they stop looking at it.

I think being in-your-face with one's beliefs, regardless of what they are, is unwise. Too often rude and a sign of insecurity.

Don't talk about what you are, be it. The actions will speak loudly.

As a rule I do not wear anything with slogans, I even try to avoid logo clothing.

I fail to see what clothing has to do with beliefs.

Maybe we could offer that woman a bite of our barbecued baby lunch?

I don't have any clothing but do sport a tattoo that makes my atheism very clear. It's cover by sleeves at work d/t a no visable tattoos rule but unavoidable any other time.

I don't do badges of any description and the only bumper sticker that I ever had was from Port Merion saying "#6 I am not a number. I am a free man"

I brought myself a bracelet some years ago and then collected various religious symbols to put on it like a charm bracelet; it had a buddha, a celtic cross, a pentacle and that's as far as I'd got when I started wearing it. A friend got really upset by it, it was quite bizarre from my point of view, and so I stopped wearing it and gathering icons.