How to explain kilt making to my Brasilian mother in law

[Sylvain]

Pleating to the stripe means you chose a line in the tartan sett and you put this line in the center of the visible part of each pleat.
Pleating to the sett means the visible parts of the pleats show as if there was no pleating at all, that is the non-visible part of the pleat (in the fold) is exactly one, two or three times the width of the sett (that is the distance between repeating designs). There are certainly pictures somewhere.

I found these about pleating to the stripe:
http://blog.albanach.org/2005/11/wha...ipe-makes.html