If you're new to sewing, I'd recommend against this. The fitted jacket is pretty much the highest achievement of the tailors art. They are a LOT of work. I've watches the Luminous Joan make a jacket and while she did a very good and careful job, it was nowhere near as nice as a well-made, purchased jacket.

If you've been sewing for a few years, then go for it. I know that I would be far out of my league if I tried to make a jacket or a formal doublet.