Hoping to get some feedback here! And also just reporting back in case there are people in similar fit situations as me who could get something out of this.
So I decided to go with suitsupply custom/mtm (in person) to try for a simple suit that fits me decently. I'm an afab butch woman with no body mods at all (no T/ top surgery) and I have a significant bust (30F ish) so the main challenge here is the shoulder-to-chest-to-waist-to-hip line being a bit more of a rollercoaster than your average amab/cis guy. I'm not looking for a perfect fit especially with a place like suitsupply that isn't really set up for it! What I am hoping to get is something that fits pretty well from a masc tailoring perspective - I'm not looking for suggestions to emphasize my waist or chest, but I'm also not trying to "pass" as male either so no need to suggest stuff to totally hide my figure either. I'm going for comfort, clean lines, and as much of a 'moderate'/relaxed fit as suitsupply can offer.
With the above in mind, here are photos from the initial fitting - lighting wasn't amazing but I tried to brighten them up in ps. It's made up in a VBC 21 micron, one of their entry level fabrics. Alterations suggested by the stylist (& me) were to take the waist of the trousers in a little (pictured) and shorten the leg just a little. Decided to go with something a tiny bit shorter than the longer leg here - hoping it'll be like, a quarter break?