‘About Gatsby! No, I haven’t. I said I’d been making a small investigation of his past.’
‘And you found he was an Oxford man,’ said Jordan helpfully.
‘An Oxford man!’ He was incredulous. ‘Like hell he is! He wears a pink suit.’

F. Scott Fitzgerald

The Great Gatsby, Chapter 7. Tom Buchanan believes that wealth alone can’t make somebody fit into the upper echelons of society, they need to be educated as well. He laughs at the suggestion Gatsby studied at Oxford, because he doesn’t wear the right clothes.