Goddess Hestia: Anime version

White clothes. Black twin-tailed hair. Looks young, yet has a large chest. This is the Hestia everyone has been talking about! She's the goddess with a lot of compassion, yet the anime version of her from DanMachi has a mysterious cord that goes around her! What is this mysterious cord? Why is it under her chest? Is it a ribbon? How does she move her arms? Check out these illustrations of her and her mysterious string!