I didn’t gain that much weight (probably about a stone which I lost within a year), though I noticed my body shape changed and the clothing styles I used to go for just didn’t look right on me anymore - that was strange as I was used to going into a shop and picking something up I liked and getting it - whereas I found I was having to try different clothes that I wouldn’t normally look twice at.
In terms of other changes:
My boobs - my babies both preferred feeding from one boob over the other, so I ended up with one boob considerably larger than the other! That itself didn’t bother me - but not having a bra that fits properly did. It drove me crazy, and eventually 10 years after my last child, i had a boob job. Not to make them bigger... just to make them the same size again so I could wear a bra that fitted.
Stretch marks - I have some, but who doesn’t? They don’t bother me in the slightest. They were initially quite red and noticeable, but faded a lot over time. I actually quite like them!
Skin - I’ve got some excess “crinkly” skin on my tummy, but again, I’m not that bothered by it.
So I’d say overall, the most difficult changes for me were changing the style of clothes I chose and also my boobs not fitting in bras.