I love the plugsuit design, and Rei is very much like me...well, physically. I like to cosplay as characters that I resemble, and she fits the bill. Besides which it's a challenge and I'm up to it. Also this costume was a great inspiration and it lead to many more Rei costumes, most of which are still in production or the planning stage, I really have fun cosplaying her!
First Place - Ayanami Rei Look-Alike Contest @ CosplayLab.com