Robert,
Most plates will accept any harness that's based on 2 inch webbing. DSS plates can be used with OMS "Comfort" harnesses, etc.
I would still recommend using the standard "Hogarthian" Harness. Why? They are cheaper, accepted by all Tech Training Agencies, and really not a big deal to use.
Hogarthian Harnesses take a little time to set up, and a little practice to get used to, but they are not more difficult or less comfortable than other choices, just a bit different.
Lastly, If you are contemplating a DSS plate and wing, you will get a substainital discount if you buy a "complete rig" That's a package including a plate, wing, harness and cambands/wedge blocks.
You can always swap harnesses later if you want, but very few do.
Tobin