Shinra-Kōketsu

"Satsuki's gonna get eaten by it. By my masterpiece."

- Nui Harime about Shinra-Kōketsu; Episode 19

Shinra-Kōketsu (神羅纐纈), sometimes translated as Omnisilk Kōketsu, is a massive garment produced by Nui Harime with the aid of mentally refitted Sewing Club members. Ragyō Kiryūin refers to it as "the ultimate Kamui". Ragyō eventually dons it to combat against Ryūko and Satsuki and their respective Kamui, Senketsu and Junketsu.

Appearance
Unlike Senketsu and Junketsu, which both were designed after sailor uniforms, Shinra-Kōketsu is designed after a traditional Japanese wedding dress, featuring large, billowing sleeves and a hood. It is huge compared to the other Kamuis and appears to lack facial features, though a pair of eyes is visible during its production.

History
The production of Shinra-Kōketsu was started by Nui when Ragyō was torturing Satsuki, in their plans to dominate the world with Life Fibers.

In Episode 23, Shinra-Kōketsu was completed, and Ragyō eventually dons it to combat against everyone else, while consuming Rei in process. In the following episode, Ragyō used its power to take away the Goku Uniforms' abilities to power itself up. However, after Senketsu pushes Rei out of Shinra-Kōketsu, Nui cuts off her own head to fuse with Shinra-Kōketsu, allowing Ragyō to fly outer space to the satellite, where she blows it, causing every human in the world the become Life Fiber Cocoons. However, with the help of everyone, who sacrificed their Goku Uniforms (including Junketsu), Senketsu transforms into Senketsu Kisaragi, which allows Ryūko to fly outer space as well. However, the Scissor Blades have no use on Shinra-Kōketsu, So, Ryūko used the satellite to explain that humans and clothing are different, thus turning the world back to normal, with Shinra-Kōketsu being destroyed.

Trivia

 * The term 纐纈 (Kōketsu) refers to a technique of tie-dying commonly used in the Nara era of Japanese history.