I'd recommend that you tack the top of the kilt and put it on to see if those pleats roll out. I think it all depends on quirks of anatomy combined with where the pleat is made on the circumference, but sometimes the pleat is pushed out. It happens with just about every kilt I have made for myself, so I pull the inner fold up above the line of the top of the kilt so there is a long thin triangle visible, which is then hidden in the waist band.
It is a technique used in bias cut garments to correct the outline of skirts and sleeves.
Another way to do the same thing would be to sew vertically along the inner fold two or three lines of stitches to make a slight gathering and so shorten the fabric. A wool could be pressed to make the shortening permanent. That could be done after the band was sewn, if the fault were only found then.
Anne the Pleater
I presume to dictate to no man what he shall eat or drink or wherewithal he shall be clothed."
-- The Hon. Stuart Ruaidri Erskine, The Kilt & How to Wear It, 1901.