I can commend the Aviation Leathercraft flying jacket most highly indeed. I have had one of the Slate Grey ones for a while now and it is excellent.
http://www.flying-jacket.com/jackets.asp
However, for actual flying of light aircraft and at a price more realistic than £250 I heartily recommed a RAF Cold Weather Flying Jacket. Silvermans do a good line - I suggest you buy a part worn one as it looks better and costs very little and it doesn't matter if you get it oily etc.
They are very practical in terms of fire resistance, showerproof, zip pockets, pen holder on sleeve and are cut short in the back so are comfy when strapped into a seat.
Cheers
WWW