That's going to be a bit of a challenge for a non-professional to adapt.

The material is good, but look where the lapels hit you, in relationship to the top of the kilt. You are going to have to move the lapel crease a LOT to make this work. That's a problem. Lapels are set in place with a lot of interfacing and a lot of steam and pressure and moving them is tricky. Moving them an inch or two is one thing. Moving them six inches is something else entirely. The issue is how they're shaped behind your neck. To do it right you'd have to take apart the center seam of the lapel and change the angle......what a pain!

Also, patch pockets are a lot easier to work with than slash pockets. I mean, you can make gauntlet pocket flaps from the extra material and just put them over the slash pockets, but I bet those pockets are too low for anything near correct placement.Hmmmmmmmmmmm..... actually the picture is kind of dark and now I'm not sure where the pockets are.

Look at it this way. The bottom of the jacket is going to be about 2-4 inches HIGHER that the sleeve length. If the pockets are lower than that, they'll get cut out and then it's a non-issue.

Hhow about the back? Are there side vents on the back or a central vent? Having a central vent is not the end of the world, but it's "better" (as in mor elike a "real" kilt jacket) to have side vents.

No one of these issues would cause me to look elsewhere for a different jacket to alter, but all of them taken together would probably send me searching.

Let us know what you decide!