Since thin is decreed to be the aspiration, designers design for it - fashion is designed around notions of surface over substance - 'simply by wearing these clothes, cool is conferred', 'By having this body shape, fashionability is acheived'. One doesn't have to approve to recognise the essential principal at work is 'if you don't meet these criteria, then you're not attactive/ desirable; in short, you're not 'in''. Very few people, even fashion disasters like me, aspire to be undesirable...