I have quite a few motorcycle themed t-shirts, that I wear when riding and not riding as well. Some are cute like the one with a picture of a bike and the words "Cheaper than therapy", or the one that says "Only cool grandfathers ride motorycles", or the one I am wearing right now that just says "Ride More". I have Triumph shirts from when I owned Triumphs and quite a few Honda t-shirts. I have shirts from most rallies that I have attended as well as from the annual International Motorcycle Show where you get the themed t-shirt for $5 over the cost of admission. For me, the t-shirts are something that reminds of my bike and riding especially during the long winter months when the bike is covered and cold in the garage. And I have never had a problem with any of my shirts offending anyone, even in this day and age when it seems everyone is offended by almost everything.
FWIW, I am a Life Member of the NRA, but I never wear NRA or gun themed clothing. Motorcycle clothing is fun and harmless. Gun themed clothing, or bumper stickers, or hats, etc. may tell a potential adversary more than I wish to tell him about myself. I carry a concealed firearm every day, regardless of what I am wearing, unless I am going somewhere where there will be metal detectors such as a courthouse. Wearing clothes or a hat with a gun theme might just alert the would-be mugger than I might be armed, and it is not in my interest to have him even think that. I like being the invisible old white haired guy, but one who is ready and willing to defend myself with a firearm if needed. But again, motorcycle clothing gives away no vital information, and might in fact be something that causes an old biker to get into a conversation with me, and that's just fine with me.
FWIW, I am a Life Member of the NRA, but I never wear NRA or gun themed clothing. Motorcycle clothing is fun and harmless. Gun themed clothing, or bumper stickers, or hats, etc. may tell a potential adversary more than I wish to tell him about myself. I carry a concealed firearm every day, regardless of what I am wearing, unless I am going somewhere where there will be metal detectors such as a courthouse. Wearing clothes or a hat with a gun theme might just alert the would-be mugger than I might be armed, and it is not in my interest to have him even think that. I like being the invisible old white haired guy, but one who is ready and willing to defend myself with a firearm if needed. But again, motorcycle clothing gives away no vital information, and might in fact be something that causes an old biker to get into a conversation with me, and that's just fine with me.