It was already mentioned here:
http://forums.filmnoirbuff.com/viewtopic.php?id=737&p=1
Post #6
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The first post got the connection between Ivy and the youth cults spot on.
Skinhead in the UK started as an Ivy style mutation. You can argue it developed into a vulgarisation of the style....
http://www.leithclothing.com/collections/shetland-jumper/products/salmon-shetland-jumper
Anyone tried any of these from Leith ?
Just ordered one...looks nice!