I use a swivel chair on wheels, no arms. It is a secretarial chair and the back adjusts so I get good lumbar support for long hours at the machine. It is perfect. I stole it from my desk - it just wasn't working there. But as a sewing chair it is fabulous. The seat height also adjust so I don't have to worry about the height of my sewing table.
Remember, comfort is more important than looks!