You folks are really addressing my concerns very well. Even though the top measure and the bottom measure are the same 46,, how things are distributed is not at all tubular, but front heavy on the top and rear heavy on the bottom, so, if I simply assumed a straight line flow, the lines would be such that the pleats would tend to gape and the line from the navel on down might not be optimal for the flow of the apron.

As pointed out, the narrow box pleats maybe should be reconsidered in favor of the knife style, but narrower than many I have seen for the front portion that is seen. So, the question then becomes the optimal pleat width for the portly and ample rear and how best to address the somewhat S shape of the whole torso in terms of allocating the cutting and the tapering to the plans. Like others, I am hesitant to dive quickly into a fine piece of fabric.

Not having to worry with the tartan design may help on this first one, but the flow and planning for that is just something that I want to be sure to account for to deliver a finished look.