As I type this while sitting at the computer, I am sitting in my father's office chair. It is wooden, swivels, is on casters and was probably made in 1930's. I wouldn't give it up for the world. Love the creaky sounds it makes and remember Saturday mornings at the office with my father.
As for a sewing chair, I went to a large office furniture store and sat in many until I found one that was OK. I chose one with arms which occasionally get caught under the edge of the sewing table. Most "experts" suggest a chair without arms for sewing but I sometimes like to take a break from sewing and do not want to find another chair to lean on those comfy arms.
I suggest you take a trip to the big city for a chair fitt>I'm another October born and want for my birthday the same thing I wanted