IIRC, the manual suggests making your underapron just an inch or two wider than top apron -- for a 16", which is relatively wide, I'd go 17 for the underapron.
Big pleat should be at least 2x the depth of your regular pleats, again it depends a bit on apron width. With a 16 top apron you can go 8 inches deep on the big pleat with no problem. Make sure you have enough fabric for all that, you can cheat a little on big pleat depth if you get short on fabric.
Have fun and keep us posted!
Proudly Duncan [maternal], MacDonald and MacDaniel [paternal].
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