Probably more expensive then most entry level racers want to spend but I like Hooker Harness http://hookerharness.com
. I have never used them in a car but they are the go to harness for my flying club so I use them regularly in the air. They are one of the top names in aerobatic aircraft harnesses and are popular in a wide range of motor sports as well.
Their belts are custom made to order. You get to choose the latch type, termination for each belt, belt color, belt width, color of any desired pads, border color of pads, and probably stitching color as well. We like being able to match the belts to the aircraft color scheme and require belts to be tagged as meeting the appropriate alphabet soup of standards.
In the interest of disclosure I do know Jack Hooker from various air shows and fly ins.