True! and the one from Crow Props isn't... absurdly expensive. My local garrison looks light on olives, so I was leaning that way. But, I must admit, I love to flounce around in a cape and the poncho is the closest I think I'll ever get!
Not at this moment. But there are high hopes we will see something like a green poncho in the Andor series. To this date there has not been seen a green poncho on screen or in any other medium for Star Wars. The costume designer Glyn Dillon stated that they simply didn't have time to make them.
They were approved for a very short time and then taken down as an approvable item when the costume creator stated they never existed. The olive poncho is not approvable. To allow it would open the door on things that "should be", not "what is".
As for white ponchos for ISB officers, we are also hoping to see them for the Andor series. A hybrid poncho was seen in the Visions animated series on an ISB officer, but this has yet to been submitted to be made as a CRL.