Thank you both for the info!
I am losing weight, albeit at a very slow pace (15 lbs since spring

). I don't wear tight-fitting clothes, so I don't need it to be perfect on the chest - I think being a bit broad-shouldered might help there too. I can handle some discomfort, especially if it means being able to present decently.
Between both your answers, I'm rather torn between the medium and large xD If I get a medium and it's too small, though, it might give me a tangible goal, weight-wise, to work towards...
-pondering-
Some of the other models look neat too- definitely variety there, so I can experiment with a few and see what works for me, I suppose

Thanks, again, for sharing your experiences!