AVOID THE "CLASSIC" HALF HARNESS!!! (aka the nutcracker). If you see this harness in any catalog, you'll always see a woman modeling it, there's a good reason for this. Yes, my boat came with one and being new to the trap I was stupid enough to put it on and lean out there. It only took me about half a second to let out a loud scream and realize that was not the harness for me (however it is still good to play a joke on friends who have never been on a trap before).
I ordered the Murray "Race" half harness and have been very pleased with it. I use a regular buckel and I'm pretty comfortable in it. One day I might order a spreader bar and see if it makes it even more comfy.