Kilt Apron Question(s)

[Arnot]

I am currently making a piper's plaid for a local piper. It is the same tartan as a kilt he has had since he was 18 years old. Anyway, as we were talking about how he wanted his plaid to be done, he mentioned a problem with his kilt that I will be looking at later. He said that the apron comes forward on each side of his sporran and sort of curls around it. I have a couple of theories about what the problem might be, but I thought I would check here as well. Any ideas what might cause a problem like this? Any information will be greatly appreciated.