The default costume of hololive English's Ceres Fauna, as seen in post #4725523 and post #4723678.
She wears a blue dress with a frilled inner layer skirt, white outer layer dress with a blue ribbon, partially fingerless black gloves, a single anklet on her right leg, and a single white thighhigh on her left leg.
This tag implicates ceres_fauna (learn more).