I recognize a gig line as a Naval term describing an imaginary line straight down from one's chin. The working uniform belt buckle's side must line up perfectly with it, so I'm a little confused by that term as used with a kilt, regardless, I too suffer from purchasing my first tartan without having an experienced kilt-wearer with me, so the right side of the apron doesn't match up exactly with the pleats {sigh}. Live & learn. No worries, the general public doesn't notice as all they see is a guy in a kilt, and honestly, I think you'd have to be standing perfectly still for it to be noticable. You may be able to move the apron closer to the pleats by experimenting with different positions of your straps.