Originally Posted by The Louche
I use a similarly priced (albeit full canvas) American MTM program, and they will alter lapel width as much as you'd like. I don't see why this would be difficult.
Because lapels and collars are die-cut for maximum precision and if the customer wants a width of lapel for which dies are not available, new patterns have to be custom made for the facing, undercollar and top collar, because the facing is the one piece whose grainline depends on the width of the lapel and thus must be manually rotated in a marker when it changes which is a PITA in a shop which is aiming for a bit of efficiency.
It's really one of the few alterations that are usually actively discouraged.