The default costume of hololive English's Hakos Baelz, as seen in post #4724951.
Her default costume consists of a black, spiked collar, white-colored long-sleeved crop top with a stylized "RAT" printed on it, single black glove on one hand, and a multicolored skirt with mismatched legwear and black shoes.
Baelz's white shirt has been frequently depicted inconsistently across numerous official art and fanart, either as an off-shoulder shirt (the white sleeves attached, as in post #4984329), or a strapless shirt with detached sleeves (the white sleeves are not attached, as in post #5852199). Due to frequent mistagging, tag her attire only as off-shoulder shirt if the sleeves are still attached to her shirt; conversely, tag her attire only as strapless shirt if you can tell for certainty that the sleeves are not attached to her shirt.
This tag implicates hakos_baelz (learn more).