Cubs.com is selling an odd retro jersey:
Eckersley wasn't on the team in 1978, nor did he ever wear this (ugly) jersey. He didn't get here until 1984, when they were wearing the blue softball tops.
They also have the same '78 jersey for Santo, Sutter, and Sandberg. Only Sutter of these three was around at the time. The rest of the retro jerseys on cubs.com appear to be legit.
So I ask, if you want a retro pajama jersey, why would you get one for a player that wasn't even on the team? Is it too much to ask for a Buckner or Kingman jersey like that?