...than finding pictures of Centauri officers. And that is finding pictures of Narn children, specifically females. Sorry Centauri-philes, I also play a young Narn girl. Other than Na'Toth, who is probably at LEAST 17 years older than her, I have no inspiration for how she would look, dress, or act. So, I make it up as I go along. I have a feeling that might be the way you'll have to go with your uniform querry.
You might try looking through the episode synopses at the Lurker's Guide. There are episode specific pictures interwoven throughout the text. You might get lucky. Pick an episode that you know involved the Centauri in a space battle and have a look-see. I don't like your odds.