Kill la Kill (キルラキル) concept art of Ryuko Matoi illustrated by character designer Sushio (すしお) in The Art of KLK Vol.1. Surprising to see at one point Ryuko looked more like Satsuki!

Matoi Ryuko in the Kill la Kill official settings and material book Volume 2

If there’s one thing I really appreciate about these designs it’s that Ryuko, despite looking fundamentally the same, gives off completely different vibes in each outfit. She looks childish in that robe and also in that wedding dress. She looks really mature in Senketsu Kisaragi. I think this art book made me notice that a lot more.

Satsuki Kiryuin & Ryuko Matoi by ASK

Ryuko Matoi Episodes 1-24 

KILL la KILL (キルラキル) illustrations of Ryuuko & Satsuki by TRIGGER animator Kengo Saitō (斉藤健吾). It’s SO beautiful seeing them in real clothes. (X)

KILL la KILL (キルラキル) Animator's Art (X)

Megane Satsuki, casual Satsuki and Satsuki dressed as Adiane, illustrated by Kill la Kill animator Kengo Saito. 

Taken from his book Saito Kengo Vol 1.

KILL la KILL OP 2