I don't know if it will help, but I found this link that talks about the different sweaters. I didn't read it all and thought I would just post it for you.
www.uni-watch.com/2010/11/10/sweater-weather/
Also, I found the below image while searching, which actually took me to the above link. Here is a link to the photo:
http://farm5.static.flickr.com/4131/...d32aa131_o.jpg
And then there is this, which does show some colors, but not of your photo:
http://origin-sp.global.ralphlauren....baseball.aspx?
Here's an artists rendition of the colors:
http://fineartamerica.com/featured/1...e-dininno.html
And my guess on the ribbon tied to the button.......it is not a ribbon, but a frayed string tied to a pencil that he kept in the sweater, which is causing the line to appear in the sweater above the elephant.
Good luck in your quest.
Ted