After four Kilt Kamps with Barb I can attest that 'lefties' can indeed make a kilt. Each year there is at least one leftie in Kamp and Barb always asks me to show them how I sew left handed.

Think of it this way.

Imagine you are sitting in a chair facing a right handed kilt maker. Cross your knees and lay out your fabric exactly as they do. Think of the right handed kiltmake as a mirror in front of you.

The right handed kiltmaker has the pleats facing away from their body towards you.
Gather your fabric just as you would see it in a mirror.
The pleats face toward your body.

The right hander sews from the bottom of the fell on your left up to your right. Do exactly the same thing.

I've never uploaded the pics from Kilt Kamp 2012 where I am showing a leftie my technique. I'll see if I can find those when I get to the shop this morning.

Until then though, this kilt was completely hand stitched by a leftie.