Mark writes...

1) All the Kryptonians in the Phantom Zone wear the same black and grey outfit, with red crests were present. Is it a standard prisoner outfit, a Kryptonian military uniform, or a uniform of the House of Zod and its followers? Or does it have another significance?

2) I notice Lor-Zod wears something similar but distinct, with an orange crest instead of a red one. Did the uniform/outfit change in the 31st century, or is Lor's just different?
3)What does the different color crest signify, if anything?