The default costume of hololive's Natsuiro Matsuri, as seen in post #3310397.
It consists of a cropped halterneck pinstripe black camisole with spaghetti straps, a green neck ribbon, an orange short-sleeved off-shoulder cropped jacket a white pleated miniskirt with a side slit, a black pantyhose and white boots.
This tag implicates natsuiro_matsuri (learn more).