I have a short waist like Meghan and looking at the pictures of her dresses and shoes is really interesting - like looking at fashion bloggers who have a similar shape to you. I think she looks really average in wrap and tie waist dresses (as do I) and I'm not sure why she keeps opting for them.
She looks best IMO in skinny jeans, with shirt/blouse or pencil skirts (or those pencil or fitted dresses pre pregnancy - however I too had quite a thick waist for at least 6 month post partum which I think is more pronounced being short waisted). If I was her, she has great legs, I would show them off rather than go for a waist cinching type dress so soon post partum.
Shoes wise, looking at her and Kate in espadrilles just so completely puts me off them! They are just awful? Not flattering, not chic.... clumpy, hoofy, clumsy even.