This fruit allows the user to stitch objects to any surface. This makes it useful for restraining people, pinning them to the ground, to a wall or even other nearby individuals. The user is also able to undo the stitches of the object with ease, freeing it from their power. In the anime, other dwarves were also seen undoing the stitches.
The stitches do not harm its victim and do not appear to physically puncture the object. The stitches are strong enough to hold Robin down, and Leo was able to stitch objects as large as Marine battleships together to prevent them from pursuing the Straw Hat Pirates. The latter proves that the ability can be used even on steel, implying that the hardness of an object does not hinder the sewing process.
This fruit does not have any known specific weakness besides the general Devil Fruit weaknesses. However, it seems that a sewing needle is needed for the ability to actually work as Leo has yet to be shown using his fruit without one.
Haute Couture: Patchwork (高級仕立 パッチ★ワーク,Ōto Kuchūru: Pacchi Wāku?, literally meaning "High Class Sewing: Patchwork"): Leo stitches several objects or persons to his opponent. Then, by pulling the thread with his superhuman strength, he causes all stitched objects to converge towards his opponent, crashing into them with great force. It was first seen used against Giolla, stitching all of her comrades and subordinates around her.Haute Couture is French for "High Sewing" and refers to the practice of creating custom-fitted clothing.
As with the Mato Mato no Mi (which was referred to as the "Mato Mato Curse"), this fruit was not actually named in the manga. Leo referred to his "magic" as the "Nui Nui" power ("ぬいぬい"の力,Nui Nui no Chikara?), notably in hiragana rather than the katakana used in all Devil Fruit names. It was finally named and confirmed to be a Paramecia-type Devil Fruit in the One Piece Magazine.