The default costume of hololive's Laplus Darknesss, as seen in post #5659041 and post #5718635.
It consists of a heavy double-breasted dark purple/black coat dress with a black metal collar, and long sleeves reaching past her fingertips with solid metal cuffs at the ends, worn over a short black/grey gradient strapless and a white shirt with puffy long sleeves and shoulder cutouts (although it's sometimes portrayed in fanart as a sleeveless dress with detached sleeves and a cross-laced side slit, a yellow neckerchief with a pair of black stripes, an o-ring chest harness, a purple single leg pantyhose, ankle cuffs, and black high-heel ankle boots with colored shoe soles.
This tag implicates la+_darknesss (learn more).