Look, can we all agree that the models used to sell plus-size clothing aren't as big as most customers would like them to be and move on? The whole thing is a bit tired, especially when there is such hero worship of Crystal Renn and Kate Dillon et al who are also far from 'plus size', but nobody seems to complain about them....
Erika is 5'9". Her stats are 34dd-31"-41". She's wearing clothes that accentuate her figure and let's face it, the girl is all boobs and legs so it's easy to make her look smaller by throwing the emphasis on her legs (and by overlapping the photos *ahem*)
From what I've seen, even among plus models that have the same measurements there is a lot of difference in how they carry the weight. Some have it all on their upper body, some have really narrow waists but thicker legs, some look lean all over but they have a wide-hipped frame. All a good stylist does is figure out what to show, and picks clothes that work to best advantage, as seen in the article. We should all be so lucky to have someone do that for us!!