Funny you mention Dua Lipa because they make her look skinnier (and she's already skinny) for their campaigns, be it through photo angles, lighting etc.
It's two very diffent thing making someone look skinner through photoshop etc... All the brands do this That's why there's so much problem with body positivity
And being really skinny, no other yve saint laurent ambassador is as thin than rose is
And your first comment made it sound like it's normal for ysl to have such skinny people as ambassador when it's not