Very nice! I notice only two things that I would have something to say about:

1. The lapels are bent and the cloth hugs the pectorals too much. But I suppose that's just simulation settings.

Agreed.  I do need more tailoring work.  (I am a 'seat-of-the-pants' sort of sewer [pun intended!]...but hopefully this next piccie looks better!)

2. The cloth pattern for the lapels will come out wrong. Lapels are cut so that the outer edge is parallel to the stripes of the cloth. In your cutout pattern, the lapel edges should be straight up and down. A similar concern should be applied to the collar when you get to it, the edge of which should be horizontal.

Again, agreed.  This can be solved in several ways, in MD.  Rotating the entire pattern piece in MD's 2D pattern window  (or conversely, the texture..) [easy enough],  or by cutting a separate lapel piece [it's curently part of the front pattern], or by sewing on a revers to cover that back-facing mesh.

But, here it is with a bit more tailoring:

(..going to have to put this on hold until tonight.... hitting the bed now...)

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."