Fat shaming mother in law

I’m so down right now. My MIL always wants to compete with me. I was overweight when I started birth control when I married my husband (mind you for the 8 years we were together before that I was skinny). Well she loved it because she would shame me all the time. Bought me L, XL, even 2XL clothing 😢 I was a L at that time. She would constantly tell me how she was losing weight (btw she’s bigger than me!) so she would give me her “fat” clothes. I decided to change on my own terms after she would harass me like that constantly. I lost 35 pounds and went back to a S/M. She couldn’t say anything. Fast forward to now I am pregnant. I wasn’t really showing until now I am 6 months and I have gained quite a bit of weight. The fat shaming is back. She gave me 3 of her XL shirts because she said she lost 4 pounds so now she’s absolutely swimming in them. She said they would probably fit me right now and if I didn’t try them on soon in a week they wouldn’t fit me because I’m getting HUGE really fast. Yesterday I wore a maxi skirt that was size M and i thought it was cute because it showed my belly. She asked me “does that skirt REALLY still fit you?” Um yes? I’m wearing it right now.... I don’t know how to tell her to stop. I told my husband and he’s furious and wants to tell her off but I’m not sure that’s a good idea because then she’ll be like “I’m never speaking to you again” kind of person. And I don’t want to be overly sensitive but she really does make me feel like shit. How do I approach her or tell her to stop or should I let my husband tell her first?