These are some modifications to a Wills Wing Flylite harness:
Blue Sky Knee Hanger Harness
This is the simplest and least expensive harness that you would want.
A step up from the knee hanger is the cocoon:
Blue Sky Cocoon Harness
While foot launching or winch towing, the boot part of the cocoon will be in front of you, and will have to be suspended out of the way during the launch run. Once in the air, you would release the boot and get your legs in it one at a time.
The current favored type of harness is the pod: