Having a penchant for DIY I'm currently doing my summer GA flying in a nomex jacket that used to be the top half of an RAF Coverall Flying, which I cut off and put a new zip on. With cotton trousers and white cape leather gloves, it's a reasonable compromise.
That said, most of the time, I wear a standard Nomex suit. I recommend the Jays ones, but they're hellishly expensive. Ex-RAF ones are nice, and cheap, just very military-looking for wearing in a civil flying machine.
The link posted by sotiras looks promising, but if you buy from there, take care NOT to buy the cheapest polycotton one.
G