Seeing Tom Sharpe's pic up there, I was wondering if I should get a pipe. It's (slightly) interesting to look at writer's accessories:
Hat-Terry Pratchett
Beard-Dick Vosburgh, Alan Moore, Spike Milligan, Terry Pratchett.
Glasses-Barry Cryer, John Lennon (who wrote humourous books), Terry.
Moustache only-Not sure, possibly John Cleese.
Pipe: Tom Sharpe, Graham Chapman, P G Wodehouse.
Cigar: Groucho Marx.
Female effects are more hard to come by: I can't find a writer with a handbag in a Google search, so if there's a woman who wants to style herself as such that could work. What else could you have? Pimple? Wart? Curly hair? Lip pierced?