Thank you for your comments.

The kilt will be pleated to the set which is
6 inches, giving the choice of 3 inches deep
or 6 inches deep (or 9 or 12 for the real
masochist).

I guess I'll skip the front pleats. No one has
mentioned the double layer apron (directly),
other than saying that 2 layers in front is
usually enough.

Maybe I'll put an extra layer in the apron
and see how it works. It should be easy to
remove if I don't like it. I'll post my impression
when it's done.