Vests generally don't have plates, real or fake. Plate carriers have plates.
If you're super concerned about weight, I'd recommend an Alice rig. Go on ebay, search for "Alice LCE".
It's old Vietnam gear. Cheap, you can change your load easily. I bought a kit with suspenders, the pistol belt, 2 3-mag pouches, and 2 canteens for $15 off ebay. The whole thing weighs less than my issued LBV, and it's a ton cheaper.