This is TOTALLY AMAZING!!! God it's perfect! I'm looking at a pic with Rikku being the dark knight right now. And holy fuck, all I can say is, you did a very good job at this cosplay, it must have been took you a long time to finish it! I think I will browse your gallery, hehe...
Some parts of the knight armor seem to be missing, and you put the red things too much down (I guess Rikku wears red shorts?).
And that one brown thing shouldn't be brown at all, but you have done so well, that it's just fine. You should be seriously proud of yourself, very good job! <3