In response to Brian's question about how trad singers were affected by the revival, the late Terry Whelan once told me that Fred Jordan, when he was first 'discovered' and invited to perform on a stage or at a folk club, dressed in his best Sunday suit. It was quite soon afterwards that he kept his farm-labourer's garb on for performing. Perhaps he found it necessary to conform to the expectations of the public?
I consider it quite likely that his repertoire was expanded too by listening to many more singers than he would have had access to in his home village.