I've seen one where the shaping was done entirely with canvas and the iron. Very impressive bit of work
Nice! I'd love to have seen that in person.

I've been buying the magazine Threads over the years and every now and then, they will dissect a designer's garment to show how the designer achieves the underlying shape. I've read how to shape the top of a sleeve without gathers using wool canvas and steam, but an upper jacket would be really amazing!