Same hair as Yuna, don't have the eye color of any of them (unless Garnet or Rinoa have brown eyes, i don't remember their eye color, nor do I care because I will not change my eye color with contacts for a cosplay, those things terrify me. It's bad enough that I already have poor vision)
In any case, I'd cosplay as a man more likely. Squall, my beloved. Or Kazusa, love him too (and I already got the glasses, even if they're not the exact same style, but eh. No need to be 100% identical)