How does my mother always make me feel so bad about my body?

I know she doesn't mean it, and it's never intended in a belittling way, but it seems like so often when I come to see her, she winds up saying something that makes me feel so self-conscious. This time, she offered to buy me "some pants that come up higher and some shirts that some down lower". Previously she's reached out and tugged my shirt down, saying something like "nobody wants to see that". Thanks mom, I know I'm fat, I know you can see my belly, I'm trying to live with it.

I mostly just smile and nod and don't bring it up...so far it doesn't seem worth it to talk to her about it, especially since she's kind of a busybody by nature and I doubt she'll actually change, just feel bad about it. Does anybody have advice or mother-related body rage to share? It just makes me so frustrated! It's like she has some magic, shitty mom-power to make me insecure despite the fact that I moved out seven years ago and am a grown-ass person!