advice on pleating / yardage

[Dutch piper]

Hi,
I'm about to make a kilt for a rather big fellow (hipsize 55").
He wants a kilt from the "henderson modern" tartan.
the tartan has a sett of 8,5 "



I can purchase extra fabric (say 4,5 yard double width) and pleat the kilt to the stripe.
Or as the customer suggested, pleat the kilt to the blue and the black stripe (so I would use half the sett).
That way I can use a normal kiltlength of tartan.

Does a kilt with a sett-size of 4,25" still make acceptable pleats?
They will be very shallow.
And does it look allright to make a kilt pleated to 2 different stripes alternately?

With kind regards from the Netherlands...
Dutch piper