I had a little bit of time, and thought I'd try to help...
Found this colored drawing online...might help, as it seems like the artist had some prior knowledge of the color being Blue.
http://fineartamerica.com/featured/1...e-dininno.html
More info pointing towards Blue...
http://www.sportslogos.net/logos/lis...hia_Athletics/
http://www.sportslogos.net/logos/vie...ame-Worn_Photo
Scroll down, actual sweater on right in showcase (dark Blue?)
https://philadelphiatale.wordpress.c...ics-a-history/