I have a personal Diving Concepts horror story...
My custom DC suit didn't fit right either, and when I contacted them they blamed it on the measurements, and wanted to charge me a bunch to fix. It was just too short in overall length, but was really only an issue when I tried to reach back to touch my valves. Still I ended up going through a bunch of tech classes with hating valve drills.
I should have pressed them to re-cut it, but I guess I'm too easy to accept what I have.
I also watched a guy order a custom Bare suit, and between the back and forth arguing, shipping, etc, it took him TWO YEARS to get it fitting right.
A suit must fit well to really be enjoyed. And believe it or not, "custom" suits often do not. Which is why the six of us like the Fusion.