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Does anyone know what is the movie accurate angle of the No Ghost patch on the flight suits?

Not sure if this helps, but on the wiki is an original patch referenced to the ripstop pattern on the flight suit sleeve:

https://www.gbfans.com/wiki/Flight_Suit

The ripstop pattern is straight on the sleeve so that should give you the angle you are looking for, yeah?

Here's some decent shots from the first movie:






It looks like they might be rotated counter-clockwise something like 5-10° when the arm is positioned directly perpendicular with the floor.

Ok, what about the size of the patch?

Check these measurements from a screen-used flight suit: viewtopic.php?p=4930662#p4930662