You need to check over on ASAP as a group is trying to get the right Third Season fabric.
The First two Seasons were Velour and as with all of Trek's Command Shirts a very hard Color to peg. That Velour is impossible to find now though
The Third Season is not double-knit like everyone thinks close though and is another weird Color, Theiss called it Avocado.
Sadly the people who DO know where to get the Fabric as well as where to get it Properly dyed, The Dye house who did it for the Series is still operating and has the exact formula, are no longer doing any Tunics or can not be trusted.
I have no time right now but maybe in the future, a year or two and no one
has stepped up to the Plate I will do a run of Fabric for Third Season Command