“It was the red socks,” the actor explained. “Because he was Pope, I found the company that makes the Pope’s socks.”
The series doesn’t spend a lot of time looking at Gerbert’s feet, but some brief glimpses confirm they match the papal red he often wears underneath his vampiric black suits.
Although the show’s costume department provided all the characters a superb wardrobe, especially during its Elizabethan-set second season, Trevor made one tweak of his own to ensure his outfit was picture perfect.
At a Q&A for the Sky series, he said: “My one request to the wonderful costume department was, ‘Could I please wear the socks made by the Pope’s sock makers, the red ones?’
source: express.co.uk