Tumblr. Haha! Because we're in a scifi setting with the comic I work on, Kamikaze, we use a lot of inspiration from cyberpunk, steampunk, and afropunk styles. Now...that said, the complexity of characters costumes we have is dictated by where they live and/or come from. Those in higher status have more formal looking costumes, while those of a lower status have simpler outfits.
Case in point, this is our lead character, Markesha. She's lower on that status rung:
Clothing is simple for her. She's a runner from an economically deprived area, so she can't be in really formal dresses or the like. She needs that freedom of movement, and can't really afford any clothing that isn't actually functional.
Now take in this guy, Logan. He's higher on the status ladder.
Here you see the Mandarin collar, the shiny details, frivolous overcoats and sashes that...frankly just aren't needed. Logan even has a whole sash made of plated metal scales because he freakin CAN. You can read more about his character here. In fact, everyone from similar status as Logan has their own distinct style but equal in their frivolity, as you can see here annnnd here .
While we haven't been able to bring in TOO much of the cyberpunk/dustpunk styles yet, it's coming.
That said, one of the best things we did for costuming was figuring out an understanding of certain style trends that show up everywhere. Mandarin or Mandarin-like collars show up everywhere, but especially in the men's clothing (such as Logan above. Additionally each high status place has their own distinct style, too. Logan's family trended toward Pacific Indian styles mixed with 1920's American. Yvonne and Everett's family dress in very traditional clothing that harkens back to African patterns and Japanese silhouettes Meanwhile the Cornerstone family was very much HEAVILY influenced by Russian royalty and Celtic patterning.
All that said, if you're gonna do costuming right, keep in mind that costumes have to be functional for your character above all else. A costumer friend of mine always told me that "Function is the foundation of good costume design." My team and I took that to heart!