My buttplate bottom area (where it connects to the crotch) has almost no return edge so as to not cause discomfort when walking. Likewise on the crotch area of the ab plate I trimmed the return edges so as to not cause discomfort in the groin area when trooping.
If you're going for the original bracket strapping method, leave a bit of return edges on the chest, back and kidney plates for the bars and bolts.