Another "If it were me" response from me, BUT;
If I was a pro, I'd invest in a handful of nice looking polos or oxford style shirts in a nice, neutral color with my logo on it. That along with slacks and tennis shoes. Looks professional yet casual. Also looks like you're the boss, not the grunt of the company. People want to do business with the boss (even if you are the only one- they don't know that!). So, when networking, going to car shows, even running to the bank or grocery shopping, I'd wear that as my 'uniform'. Taking every opportunity to network to people looking professional. You yourself should also be clean cut, shaven or trimmed, and appearing clean and professional (if you look scruffy, whose gonna want you to clean their stuff?). If you aren't networking and marketing your business while running your errands, then you are losing business to the guy who is!
I can speak to the comfort and utility of the 'above'. I'm a Pastor, so people expect me to look professional and I expect that of myself! (As I'm not one of those hip urban Pastors who has a soul patch and preaches in a graphic T-Shirt and bluejeans, hehhe). But wearing a jacket and tie can be cumbersome AND pricey to maintain when you are dealing with funeral homes, nursing homes, hospitals, or even just visiting parishioners homes and places of work. So during the week, when I'm not leading worship or in a meeting or doing some other sort of 'at the church' type work, I often wear slacks, a polo or short-sleeve collared shirt, and a nice neutral colored (brown) pair of tennis shoes. It looks nice, but it's not a big deal to get something spilled onto you or get a stain, and it doesn't look AWFUL and wrinkled at the end of a long day. It's also very comfortable!
When 'working', I think T-Shirts with your logo and pants that don't require a belt (aka waist-mounted paint scratcher) and foregoing rings, watches, etc., is a wise choice.
To answer the question personally, I'd detail in my underwear if I could! Hehe, okay maybe not. I just detail in whatever I'm wearing, sans belt/watch/ring/pocket contents. But I just do it for myself!