I know a lot of actors talk about the importance of wardrobe, and it always seems like it's kind of a cop-out, maybe, because it seems like a minor detail to some people. But I think it's hugely important.
I've said this so many times but there's a magic when you have a really good actor in a really good makeup.
Everyone is going to binge on a diet, for instance, so plan for it, schedule it, and contain the damage.