The default costume of hololive's Yozora Mel.
It consists of a (quite revealing) strapless cross-laced frilled chemise with an underbust empire waist, and a front slit, yellow short see-through detached sleeves with bat prints, a black pleated miniskirt with a see-through overskirt on top, a gold trimmed red belt, gold trimmed black thighhighs, a black choker, black bracelets on her right wrist and black fold-over ankle boots with bows on them.
This tag implicates yozora_mel (learn more).