Hermeshermione started this thread in Jan 2011 about a well loved csgm, purchased in 2010, an ex libris csgm from 2008AWThis is when my craziness of taking digital photos helps!
I believe the first season of the original decline was the season that they did a CSGM of Belles du Mexique.
My photo of it was taken January 2009 - so, approximately A/W 2008 or S/S 2009. I am trying to recall whether I had the same problem with the Tohu Bohu reissue, which was A/W 2008. I had a friend who bought that one too, in the pink cw and IIRC it did not wear well.
Your dates of late 2008 or early 2009 make complete sense for the first bad ones, it usually takes a year or two for scarves to get worn and for feedback to start coming in