In the Infinite Tsukuyomi, Gaara dreamt of having a normal childhood. He wasn't tormented because of him being a Jinchuriki and he had a happy family with his sister Temari and brother Kankuro. The best part was that his mother was alive. But the one thing that made him happy as equally as his mother did was Naruto. In his dream, he and Naruto grew up with each other and their families let them play with each other along with the other children in the Hidden Sand Village.
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In the real world, Gaara was cocooned and assimilated to the Shinju Tree just like Temari and Kankuro were along with everyone else on the planet. In the real world, Naruto wasn't there for him this time. It wouldn't matter anyway. He'll have no need for him once he was finished being transformed into a soldier.
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His clothes disintegrated in the first year. The only article of clothing he had left was the gourd on his back and the sand that came with it.
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A year later, the gourd was slowly dissolving into sand. His jutsu was being drained and therefore was losing control of the sand.
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Another year passed. Gaara's skin was starting to become white, his hair was fading from red to green, the tattoo with the kanji for "Love" was fading away and his eyes became yellow. The gourd was almost dissolved.
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By the time Gaara's body had been drained a year later, his self was already being drained as well. Already, his mother's love was gone and by that time, his cocoon was full of sand. But, the sand could tell this was not Gaara so he didn't need its protection. Gaara didn't notice. Besides, soon he'll have a new mother. One that he and his brother and sister will soon protect once their slow transformations are complete.
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A year later, Gaara had been reduced to a shriveled husk. He looked so much like a mummy, his body would have felt right at home with the sand surrounding him. Now the cocoon can begin the process of bonding with his body, ignoring the sand.
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The years went by and the cocoon bound itself to the body, tightening itself to the point that arms, legs, and facial features began to form.
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When White Zetsu was done being formed from what remained of Gaara, he landed on the ground to join his fellow White Zetsu. He didn't realize it, but the two beside him used to be Temari and Kankuro. White Zetsu noticed there was some sand on his self. Without giving a second glance, he brushed it off. Before, he used to be alone and everyone hated him and he had very little friends. Now, he was one with the crowd and they were all comrades in arms. He was a loyal soldier, a part of a huge army, ready to obey Kaguya-hime's orders. The first thing she required her army to do was to be ready for the two invading interlopers. She had to protect her planet and White Zetsu was but part of an army of seven million strong that would aid her.