never heard of it either, and i've been collecting for almost 11 years. where did you see that term anyway?
I thought it was here...
If not then on JC, ProJerseyTalk or SneakerTalk for sure.
On SneakerTalk.yuku this term was mentioned again and again. For a significant number of jerseys actually. E.g. for both Jordan's red and black pinestripe, for a lot of older Champion Authentics as well as for the newer ones like this Allen's one I asked you for legit check 3 days ago.
It's not connected with a single manufacturer/material for sure since I've seen it used for multiple brands and materials/designs.
I assume it's a description for the most valuable, unique jerseys, of some of the greatest players. Holy grails as someone would say
, which have historical significance. Hence they are also very expensive.
Maybe I'm wrong but I understand it this way...