I think Bono copied that Lennon look circa Pop, not Zooropa, which is more like the Who
U2 were possibly mocking Keith Moon's propensity for all sorts of outlandish uniforms including Nazi outfits:
Moon wasn't the only one, as this pic of the Stones' Brian Jones in SS uniform shows:
BTW, this is Lennon reading about Jones:
Both Jones and Moon were only taking then current fashions to their most shocking limits, and dozens of Punk band would imitate them ten years on.
Note that U2 were also using Nazi clips (from Riefenstahl's "Olympia") during segments of Zooropa, and Bono's Zoo Station opening act is clear homage to Dr. Strangelove (also with Nazi references)
EDIT it was Riefenstahl's Triumph des Willens, around the 42:00 mark:
http://www.youtube.com/watch?v=LPAxaFxjiDk
Some other iconic examples: