There is a fact worthy of consideration; some of these brands take advantage of plus size for-profit and the promotion of their brand images, as opposed to really understanding the needs of large size people.
Certainly, there are excellent examples of companies that specialize in producing large size clothing. But to be honest, their products are cheap, uninspired, and conservative for women who feel insecure about their own body shapes.
Or on the pretext of designing for plus size girls, the garments are overpriced.