The ghoulish comments about PoW, someone who has always been very slim, mostly muscle, little body fat. Considering she had chemotherapy, she looks surprisingly radiant. (Some) chemotherapy drugs can distort, even erase one's ability to taste things (and for an unlucky few, their sense of taste never returns). This make eating miserable. And this in addition to feelings of nausea and lack of appetite anyway. Regrettably, these things do not disappear the moment one finishes chemotherapy. They can linger for a good few years, if not longer. Also and perhaps most importantly, chemotherapy takes a lot for the body to get over. Any calories eaten pretty much go to rebuilding one's cells at the most fundamental level. People continuing to lose weight post-chemo is a thing. But, PoW looks great and is clearly doing well. She will fill out a little more with time, although she was always very very slim to begin with. And there's nothing wrong with that. All the women in her family are long and lean.
FWIW, I had chemotherapy and radiation. Indeed, when I was going through chemo, I was lucky, I did not lose my sense of taste totally but certain things - citrus - tasted of cardboard. I also had terrible reflux and there were certain textures of food I just could not bear the sensation of eating. I also lost my ability to drink hot drinks. Even now, almost 18 months since my last chemo cycle, I still struggle to make myself drink anything hot.
To return to topic, OP, glad you found a dress you love! Also love what your OP said!