maimoto keisuke (2nd costume)
The second costume and current default costume of Nijisanji's Maimoto Keisuke, as seen in post #6668363. Debuting in February 2019 for Valentine's, it became his default in January 2020 after it received an update that allowed the suit's jacket to be removed.
This tag implicates maimoto_keisuke (learn more).