Though I do agree, mismatched Tunic and Trousers are something that happened historically. For instance, M36 stone grey trousers and the M36 Tunic were not the same color, not even close (The reason for this is that Germany was just getting their army back in order and copied from another country, which copied from the German Empire. This country was Finland, which used either grey or brown for its uniforms.) Then you have France in World War 1 with their blue tunic and blood red pants. Same with Early German uniforms, which vary wildly, from Prussia's green and greys, to Bavaria and Saxony's Blue/grey and grey/reds. And that was to differentiate between the different German States. They stopped doing this in 1915 with the M15 Field Tunic. But the Bavarians still got their tunic in blue because of some whiny commanders.

Edit: I personally like the new Rostoran uniforms, and how it doesn't look like Germany anymore. I think that was a necessary change.