The pleats under the apron are important as they define how far and how easily the aprons will fall vertically when you sit - but also how easily and how far they will fly up.

Now with denim I would not think you would have much trouble with the fabric flying in the breeze, so it might be a good idea to make fairly deep under apron pleats and to have small pleats for a few inches more than half the hip measurement, so that the apron and under apron slide easily and drops between your knees for confident sitting.

For me 2 inch pleats is a bit skimpy - but I tend to be generous in most things. Just be sure that when you sit down there is going to be enough material to go round.

I make my kilts in a reverse Kinguisse style, so the two sides are mirror images, with the small pleats pointing to the back where they meet in a large inverted box pleat. The two aprons are hemmed straight at the edge of the fabric, but shaped within the length, so I make a pleat 2 inches deep which is pressed out so the bottom edge of the aprons are 2 inches wider than at the waist edge, and then I make a large under apron pleat and only then start the small pleats.

This style suits me better than the traditional or the original Kinguisse style with the pleats opening towards the front - I catch then on everything around the garden and even in the house.