I am the same way as you are. I take pride in staying in shape and don't want to "let myself go". When I was expecting our little one, I told DH that, if I started to look dumpy post-baby, I'd appreciate it if he told me so I could work on it. I told him I wouldn't be mad. Thankfully, with nursing, I lost the baby weight really fast and was back into my pre-baby clothes. So far, he hasn't needed to say anything to me but, if I start sliding, I'm glad to know he'll let me know.
Of course, this just applies to me.
It's interesting to me that you believe you won't be able to tell if you're looking dumpy, and that you'd need his input.



I will say he learned that was not the way to approach me very quickly 

Sacrasm to be exact.