I read this post and I find it very interesting. In particular the picture of the cape posted by hellhippie i find very interesting. At first sight this cape looks the same as the other YPS/PBP/TRILOGO capes, including the one posted by general kahn where chris.75 refers to:
https://www.imperialgunneryforum.com/t4994p150-imperialgunnery-com-track-the-updates-hereBut the cape posted by general kahn is in fact not the same cape as posted by hellhippie. I have both types of capes in my possession and although they look the same at first glance they are not at all. I will try to explain. I will first post a picture of the NON glossy side of both capes:

The one on the left is like the one posted by hellhippie and the one on the right is like the one posted by general kahn. Pay close attention to this part to distinguish both capes. They look the same if you look closely (reverse the cape if necessary) and you will see that this cut will not match.

This is a picture of the glossy side of both capes:

Both capes are flexible and glossy on one side but
Cape #1 is almost as glossy on the other side, very white, 2mm longer than cape #2
Cape #2 is very rough on the not glossy side, a bit yellowed
I have my doubts about cape #1 (the same as hellhippies cape), but I still hope they are both legit.
I have another cape just like cape #2: I will call it cape #3. The shape and size of cape #2 and cape #3 is 100% the same, also in respect of the cuts on the top. The only difference between cape # 2 and cape #3 is the colour (cape#2 is bit yellowed and cape #3 is white) and the rough side of cape #2 is very rough on cape #3 is less rough.
I will now post a picture of the NON glossy side of the 3 capes together (PAY attention because I have mixed up the order

).
The order is cape #2 , cape #3 and cape #1

And now the glossy side:
again cape #2, cape #3, cape #1

All three capes are made of a different material. I suppose that the difference in material between cape #1, cape #2 and #3 (and thus the difference in roughness on the non glossy side) could be due to the fact that in the factory they just took another material when the old batch was finished.
Also the difference in colour could be explained, due to colour fading over time. However capes #2 and #3 are 100% the same as for the size and shape. Cape #1 has a different cut at the top and is 2mm longer.
I hope they all 3 are legit. As said I have my doubts about cape #1, the one like hellhippie. I hope that some one can shed a light on this and can confirm that they are all 3 legit. Maybe even confirm that one of the capes should in fact be attributed to a certain figure, like for example a PBP/poch figure, the YPS or the PBP/TRILOGO.