Seat upholstery advice

Dear all, I bought a very nice Rinaldi wire chair (see photo 1). Not sagging, but currently without pillows. It’s not a bad fit, but it lacks a nice cushion.

Does anyone have any advice on where or how I can get a ‘seat and back’ or ‘seat’ cushion made?

I prefer a tub model like in photo 2; but like photo 3 I don’t think it’s wrong either (except for the colors, all very plain.. white/black/gray)

Thank you in advance!