‘He’s a dear little man,’ said Lady Alleyn emphatically. ‘The nicest possible little man.’
‘Not so little nowadays. He’s very plump and wears a cloak and a sombrero like G.K.C.’
— Ngaio Marsh, Death in a White Tie
I’m quoting this not so much because I like the prose particularly, but because it highlights how well known G.K. Chesterton really was in England back in the 1930’s when this was written: well enough known that Marsh could refer to him by his initials without any explanation whatsoever.