The over apron is A-shaped, so the reverse pleat will be narrower at the hem than at the top/waist. 2.5 flare may be too much for your son, you could try 1.5 or even .75 at each side (for total 3 inches or 1.5 inches difference between apron width at hem vs. waist). Less flare also makes it easier to sew, as the top of the pleat wants to angle downward when you fold it in the A-shape. Too much downward angle, and you won't catch the inner folded edge of the pleat in your waistband seam.
Whatever flare you choose, you'll match when you fold the right-hand edge of over apron for finishing.
Not sure this pic will help, but here's the front apron of an XKilt-in-progress with the left-hand lower edge folded back to show a very deep reverse pleat. I think you can see the apron's A-shaping (wider at hem than at waist).
Proudly Duncan [maternal], MacDonald and MacDaniel [paternal].
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