When I was doing my apprenticeship, I designed decals for my mentor's rig, as well as hoodies, ball caps, and jackets. People stopped us at coffee shops, gas stations and ever saw people taking pictures of the info at a red light once. I still wear my original jacket, and carry cards (my own and my mentor), and I still get stopped often.
IMO: worth it, but we got smokin' deals on everything (I'm a graphic designer, and we had a client who owned an embroidery shop and traded our clothes for a shoeing!). I don't know when we would have made money on the cost, had it been full price.