This was in a book supplement from The Observer last Sun:
'Some go to extremes to find the perfect envornment in which to write. When faced with writer's block, Victor Hugo, the author of Les Miserables and the Hunchback of Notre Dame, disrobed. He had his servant take his clothes away for the day, leaving him with only pen and paper so he'd have nothing to do but sit down and write. DH Lawrence took the idea to an extreme: he'd climb mulberry trees in the nude, finding the rough bark stimulating...'
So there we go! The answer!