I do several HPDE's a year, and picked up a pair of Piloti's. Believe they were less than $100 bucks from one of the racing suppliers like Pegasus or RPW. Main advantage to these type shoes, is could feel a dime, if stepping on one. Some think they're comfortable for all daily uses, but I don't. Prefer cushioning of my Adidas when going to the hardware store.
There are several good brands like Piloti, Simpson, Sparco, Alpine Stars, etc. Obviously, you want comfort, ventilation, SFI (FIA?) rated, a rounded (gripping) heel and toe patch for shifting, etc. There are high top and low 'street' styles to choose from. Personally, I'm not fond of ordering mail order shoes....I like to try shoes on before buying. If you can't find a store that carries racing shoes you might find them at track events (at least the organizations I run in also sell some racing gear). Saferacer.com is a good Internet source as well.
Racing shoes are nice and the safety factor is worthwhile but you still can drive fast in tennis shoes.
__________________ 2005 Corvette C6 Coupe
Magnetic Red Metallic II/Cashmere, MN6, 1SB, F55
Lingenfelter 403 Conversion, LG Pro Headers (coated), Corsa Sport Exhaust, Lingenfelter CAI, Accusump, LGM Coil-Over Suspension & Bump-Steer Kit, T1 Sway Bars, Pfadt Control Arm Bushing Kit, Elite Eng. Tunnel Plate & Oil Catch-Can, SKF Racing Hubs/Bearings, AP Racing Brakes, DRM Brake Ducts, Custom Roll Bar, Sparco Seats, Wide-Booty, CCW C10 Wheels,Setup: LG Motorsports
as Wayne sez above, ventilation is kind of important since the foot area of our cars does get hot. I found, by accident, a very thin-soled pair of (maybe?) running shoes with open weave mesh sides (by Converse). I don't know what "type" of running shoes they are, maybe cindertrack, or some such. but they work very well, and I "save" them for driving only and have had them for about 4+ yrs.
I drive in socks too . Tried all kinds of 'driving' shoes, and all of them were 'poseurs', meaning they're walking shoes that look like driving ones (narrower). And even those were too wide for the 430 (3 pedal car), so had to drive barefooted... and felt great. My next attempt at a driving shoe will be a real racing one, like Sparcos, but would have to try them first (tired of throwing money away on driving shoes online). The most important part of a driving shoe to me is feel, so they'd have to have a minimal sole. Wish I liked the typical ones, since you can walk on them. My solution is I wear any shoes I want, and drive barefooted (in socks) . The feel is awesome with my choice of pedals :