The base mesh of this models was done in Vroid studio and then the clothes, accesories and hair was modelled in Blender 2.8.
The textures were done by @kakikaturas (https://kakicaturas.artstation.com/)
You can see the Making of here:
https://www.artstation.com/miaurasaki/blog/ovlq/the-making-of-garden-world