Relena was my first official cosplay and I wore these three costumes for her at my first convention years ago now.
I had completed 3 of her costumes, and was half way through a fourth (queen dress) when I retired them all.

I made all of the costumes from scratch...no modifications from stuff out of closet, so it was a bit of work, and I feel worth the effort because it was alot of practice.

I very much liked cosplaying her, and at 16, as quite well suited to personality wise, so it was fun. The only draw back was the lack of maturity so many people displayed when harrassing me for my cosplay choice, due to Relena's unpopularity in the States.

I've put up pictures of the Sanq Kingdom school uniform, her plain clothes costume, and her blue birthday party dress.

I clumped them all together since they are all the same character and all long retired~