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[Hans Lemurson]

After butchering my wagon's Yak to feed my dwarves on a glacier, I noticed that my tannery had 3 "Yak Leather" in it.

Is leather-yield dependent on animal size now? 
Do we know the formula for leather yield?
I wonder what the threshold is between getting 1 leather and 2.

[Saiko Kila]

This is something new, but yes, tanning a skin from bigger animal, like water buffalo, also yield three leathers. Even if done by someone without Tanner experience, which suggests it's based on size. Skin from smaller animal, like camel or yak, yields two leathers. Skin from yak calf yield only one leather.

I suppose this may be based on size of the skin, which in turn is based on the size of the animal - my bull yak was over 667 kg and had skin weighing 15 kg, while the water buffalo weighing over one tonne had skin 22 kg. Your yak must have been quite big.

Yak calf weighing 192 kg yields one leather, while yak cow weighing 325 kg yields two leathers, so the threshold must be somewhere between these masses for animals (or masses of their skin).

[Tamren]

There is a mod on the workshop that increases leather yield based on creature size. For instance large livestock like horses and yaks will not give you 7-8 leather instead of four. I like using this mod because the vanilla system is weighed too heavily towards small animals that can be bred in large numbers that still give a single leather, like cats and chickens. It doesn't make sense that you can make a whole cloak out of one chicken, but at the same time it doesn't make sense that you can only make four pairs of gloves out of a whole horse either.

Ideally at some point in the future leather will be based on more granular units and scale realistically to skin size. You can always sew more pieces of leather and cloth to create a larger object, you don't need a single continuous piece of leather unless you want to make an animal fur rug.