For me its the exaggerated puff sleeves in combination with the dress that doesn't looks great on her. The pink dress should be returned immediately, I doubt she even has stepped outside with it on.Ughhhh I have my eye on a trapeze sort of dress made of deadstock fabric by a woman down in South Africa. I’m like a US 16/18 and the photos of the dress on plus ladies makes me want it even more!
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I know it’s controversial, but I don’t think these dresses necessarily look bad on her, I just think that if you’re not tall and skinny, fast fashion (from anywhere) just doesn’t fit properly. Tall skinny gals can get away with it because they can size up and then the look is “it fits, but oversized”, but when you’re already at the top of the size chart and the piece is oversized, but not oversized enough like it would be on someone smaller, then it’s harder to pull off. That’s why brands can’t just make plus sizes and do it well. The patterns are graded differently for larger bodies. I don’t know. As I get older I just want to wear things that make me feel comfortable and that are made well and responsibly.
The dress you showed looks great, the sleeves don't overpower the dress and their long sleeve version has sleeves that are more in proportion to the dress and you can see its more balanced on the plus size model. Plus those dresses are more unique and interesting and you won't find others in the same dress just trying to keep up with a trend.
There should be a bit of balance for whatever shape you are so you don't look/feel swamped. I'm petite and dress for comfort but I always try to balance things out.