All my kilts are in the reverse Kinguisse style, and are exactly mirror imaged each side.

I put the same amount of fabric into the two aprons and their under apron pleats, and have an apron width which means that as I sit down, or lift a knee to step up, the apron slides down to hang vertically as the under apron pleat opens up.

I looked through all the information I could find about kilt making on the 'net before starting out on the first one, and it seemed logical that you would want the large pleats at the edge of both the aprons to make it 'safe' to move in.

I would advise having an under pleat on both sides, as the under apron might hold up the apron, even though that has an under pleat.