Link
I was trying to come up with a name for that stripe-piping that runs from the collar down to the waist that look awful on a few jerseys (especially the Oilers'), but couldn't come up with anything good. This article did the job: Apron strings (also referred to as Bettman stripes).
Example:

I had no idea about the "Diaper effect" since I hadn't seen too much on-ice action yet. Ugh.
But the article doesn't mention the half/short sleeve design as modeled by the Penguins:
