I HAVE DEVELOPED A THEORY!!! I believe that Christopher Judge declared that if all he was going to do in an episode is look manly and stoic and blow things up, then he should wear sleeveless black shirts to make sure people still pay attention to his stoic manliness. This is my theory for why he will flipflop between standard military outfits and the black shirts on an episode-to-episode basis. That, or they just realize he looks good dressed like that. (Oh, season 8 with everyone always running around and looking fabulous in black shirts with sleeves of varying length, I think I miss you.)
Hmm...what to watch next...