Here's a unique variation: CHW Muskoka chair.
Your back looks narrow, Dave... or is that just the perspective?
There's usually more than one way to do it...www.wordsnwood.com
Art, according to the cut list I worked from, the back is 13-3/4 inches wide so that's what I drew. It does seem narrow.
The Westport chair is considered the precursor to the Adirondack chairs we're commonly familiar with.
Inspecting mirrors is a job I could easily see myself doing.