The default costume of Nijisanji EN's Rosemi Lovelock, as seen in post #4827337.
Her default costume is a multicolored gradient red and white shirt that is decorated with red and white roses under her red dress plus shoulder cutouts, black bowtie with a red rose at her collar, green pantyhose, and a pair of red shoes with a red rose on each of them.
This tag implicates rosemi_lovelock (learn more).