AmberSpyglass somehow, there seem to be more large ladies in flesh-colour pale pink/beige clothe than there are slim ones.
It could be because the clothes shops stock far more skinny clothes than they do the larger sizes (in spite of the average size for a woman in the UK being a 16, so there should be as many size 18, 20, 22, and 24 on the rails as there are 14, 12, 10 and 8) so they don't have a lot of choice.
Perhaps if they had more racks of things in larger sizes and fashionable styles and attractive colours, the more generously built of us would spend more on clothes, thus increasing their turnover.