Oh he can do it, they love it.
Plus size isn't fat, it's just not fashion/skeletal, which is different. My best mate was a fashion model at 7 stone 10, height 5.11 and a half. They told her her thighs were too big for pix so she always worked from the waist up. She weighs normal 12 stone now.
If you see a group of them together IRL eg casting, fashion models are just a single, v distinct body type. Very long, very straight and very narrow. Flat Stanley with international hair, basically. They all have brilliant hair, don't ask me how when by rights it should have fallen out cos they don't eat.
A lot of fashion models - both walkers and photo ones - can look pretty odd without clothes. You can't use them for anything health related because no one would believe you. Or fitness, or lifestyle, or sex 'n' relationships, owt like that.
I get really tetchy about models because I used to hire them for posh books all the time and getting one who shot well without looking too thin was a right bastard sometimes.