Grrr. I'm feeling very GRRRRR towards your hubs' comment (not him, his comment) right now.
I agree with Caro that the structure of this dress is probably behind the belly. (Consider--maybe it landed at Yoox because so many women passed it up because it creates the belly.) It needs a bit more gathering to make the pleat seem more intentional. And if the dress isn't causing it? If you have a tiny tiny bit of a tummy? Well, ain't nothing wrong with that. I'll never have a flat belly. That's my body type. I also have disproportionate shoulders (10 or 12 always, even when my bottom is a 4). In return, I get boobs and I get slim hips. As Angie pointed out, models have their bodies air brushed and tweaked to make them appear perfect. People aren't perfect.
Imperfections can be your strength or your weakness. You decide which. I have a big nose. I love my big nose (almost always). I love it even after years of torment by a mean big brother. I could get a nose job. I can afford one. I haven't. My nose isn't an elegant, aquiline nose. Not a sculpted beauty. It's just a big nose. But for me, it's my nose. It fits me. It makes me different. It makes my beauty unique. I try to own that and love it. It becomes a force in and of itself, that belief.
Your body is beautiful. Your care towards it, working out and feeding it properly, is beautiful. Those things are concrete. They are real. The dress? Only beautiful in the abstract.