The British actor, who plays Marius in hit movie musical Les Miserables, has been hailed as one of Hollywood's best-dressed male stars, but he insists it is his partner, Hannah Bagshawe, who makes sure his clothes are co-ordinated.
He tells People.com, "I'm colour blind. I'm confused with colours. When I go out to premieres and events, I have to check with my girlfriend that the trousers match the top.
"I recently wore a blue suit - and I had to ask her if it was really blue rather than purple. She assured me it was blue. I could not tell the difference. I'm lucky to be with someone who is very supportive."
Redmayne has been dating the public relations worker for about a year.