This is the first Glitch Productions show not created by the Lerdwichagul brothers, but rather by Liam Vickers, who was trained by them to get experience on making a 3D animated show.
According to LiamVickersAnimation: "I like to imagine the drones stole their hair (and any unique clothing items) from the countless dead humans lying around after the mining disaster. Fashion, babeeyyyyyy!!"
While in the Original Doll is only talking in Russian in the Russian dub she is the only one talking in English.
N was originally going to be the only drone with any clothes - stealing them from dead humans just cuz they looked neat. However, it became clear clothing could help differentiate all the drones while playing up their eerily human qualities. . . not that they get cold.