Now that's funny--I can't help noticing your avatar, which is the very same guy I'm drawing!
(Though of course the likeness is a challenge in this case since all we have from the series is a blurry profile shot!)
For my own version of the Cardassian aesthetic, I've drawn a lot from Asian/Indian sources. I think for me, when I see some of the styles in-series (especially the women's hair), it evokes Asia. For this in particular, I was looking at the Chinese hanfu
style of dress (such as this
). But all of it goes through this kind of Art Deco filter to give it a more specifically Cardassian look.
There's another drawing--though it's got a LOT of errors in it and I'll eventually have to redo it--where I drew the clothing of the region of Hăzăk, where Macet and Daro are from in my stories, and I based it on the sherwani suit of India...kind of like this
. (Though I had to do a LOT of adapting to make it work in the neck region!)
I'll certainly keep you updated as I work on this more.