The default costume of Nijisanji EN's Doppio Dropscythe, as seen in post #5888040.
His XSOLEIL school uniform consists of a black jacket with the left sleeve rolled up, black fingerless gloves, black shirt, purple vest, black belt, blue plaid pants, and black shoes. He also has multiple rings and a necklace as accessories.
This tag implicates doppio_dropscythe (learn more).