yorumi_rena_(1st_costume)
The default costume of Nijisanji's Yorumi Rena, as seen on Twitter (ex. post #3562145).
Her default outfit consists of a white frilled dress with puffy short sleeves, a two-tone outer dress fastened by a ribbon, white elbow gloves, and differently-colored thighhighs (regular white on her right and black bunny-themed on her left).