Oh boy aint no one going to read this but here we go.

Walkers have a kind of simple aesthetic. Light greens, browns and blues are the common colors for the working class. Working clothes often match the Corp the workers are tied to. Now the Corporation Holders (the ones who run everything) are more likely to favor darker colors. Long dresses and military styled suits are the current norm. What the solders wear is somewhere between a WW1 outfit and a Vietnam War styled outfit. Example

SkyWatchers are the Aetheric blueish skinned sky-elves. They have a style that is best described as mage robes meet Star-Trek. They are the wizard-scientists of the world. The colors are dependent on House. However there are a select few colors that reserved for the Empresses. These include but are not limited to: crimson, deep purple and white. The warfighters are much the same as the civilian outfits except for added armor and belts. Example

Now there has been a development lately of closer relations between the two rival nations. This may lead to a mixing of fashion and taste. That however is another prompt for a different day.