Ah, thanks for the response. My confusion is that in American building, the term sheathing usually just refers to the outer layer of plywood that nails to the studs.

Edit to add: this really hasn't changed all that much in the past 100 years. Our house is over 100 years old, and is built very similarly to a modern stick framed house, with the exception of not having insulation (when built), and with the sheathing being planks instead of plywood. Also, the lath&plaster interior walls were a lot more involved in making than modern drywall finishing.