[perezfan]

I'm with Rob on this one...

For Yankee Game Jackets of this vintage, you want to see McGregor, Spalding or (later) Aladen as the manufacturer.

Wasn't there something in the original post about it being manufactured by DeLong? Did it get edited out? DeLong made lots of high school and college varsity jackets. This one looks like their top of the line model, but highly doubtful it was ever worn by a Yankees Player or Coach.