OK, finally an update. J was home for a long weekend, but it was pretty jam-packed with plans, so I only got a chance to try this on for him this morning before I took him to the airport! We had five minutes for evaluation, which is probably a good thing. Quick verdicts can be very useful -- better than hemming and hawing…
Well, he likes it! He definitely wants to see the altered version -- he agreed that it's just too much of a big rectangle on me as-is, but when I showed him the waist and shoulder tuck, he was really enthusiastic. He said that it translates much better IRL than in photos -- it's drapey and lightweight, and has movement. He loves the cutaway hemline and the tiny little cutout in the midriff that you can barely see at all in the photos. He gets absolutely zero mom-jumper vibes from this, and he's REALLY picky about that kind of thing (his ex-wife would wear a mom-jumper).
So I'm going to take it into Nordstrom and see what the seamstress suggests for alterations to lessen the volume on top while still preserving the things that make this cool (at least to some of our eyes ;-)). I'll post the results of that trip later. Thanks for all the feedback!