She's not my ideal body so I get what you're saying... but, personally, I think, it's more down to fitness. I don't think she really needs to lose a bunch so much as tighten up a bit and get more fit. But either way I love her look and personality (media)... and she killed those horrible clothes at Moschino.
Agreed the clothes were horrible and getting more fit would help - if you're going more for the athletic look, you should have more muscle and be toned. She needs to lose some fat too though. Personally I think it helps her that she has very dark skin in the way wearing black clothes makes people look slimmer - also the lack of toning and shadowing is less noticeable, as is her lack of a waist when contrasted with such bright loud garments.
I mean though if you look at the picture her midsection on our left/her right is noticeably bunching up, and her thighs look horrendous and are clearly rubbing up against one another. Honestly I see her as having a commercial body, and it's kind of a waste of face situation.
I'm calling bullshit on her having a 23 waist...