Next I will calculate the lengths of the various parts of the kilt. I like 8 inches for each pleat, and twice that for the centre back inverted box pleat and the under apron pleats.

After careful measurement of the length of fabric I have:
the edge slope and hem typically 3 inches
the apron
the shaping at the edge of the apron typically 4 inches
under apron pleat typically 17 inches 16 inches under the apron and 1 inch showing
about a dozen 8 inch pleats showing about an inch
the last small pleat on each side meets at the centre back
the edges are sewn together 16 inches from the centre back seam, and an inverted box pleat is formed.

Anne the Pleater :ootd: