John Bartlett dedicated his new collection to "the plant-based man." His Spring range was entirely made from sustainable linen. This kind of conscientiousness is rare in fashion, but for Bartlett, it's nothing new. For Fall, his line was wholly vegan: Ultrasuede for leather, nylon in place of wool. Twenty years into his career, he's emerging as menswear's most committed naturalist. That's a commitment worth celebrating. The downside is that, like many plant-based diets, this one didn't offer enough to sink your teeth into. Wearable as it all was, from suiting to cross-cultural specialties like the djellaba and adaptations of the guayabera and the shalwar kameez, it was missing some heft on the runway. A presentation might've suited Bartlett and his laudable ideals better.