We all have preferences - Primal has quality jerseys, and tomorrow will reveal what I find in person at the factory for bibs/shorts materials.
Wore this one today, my fave. As a reference on size, I am 6'1"/195 lbs regular body type and can wear either L or XL comfortably.
I have a couple Primal jerseys and they are nice. Nothing amazing but as good as PI for whatever that's worth.
Regarding size, I'm 6'3"/200 and the L from Primal fits fine. Similar it fit to PI. Assuming the custom one would be more or less the same as off the rack.