sasaki saku (1st costume)

The default costume of Nijisanji's Sasaki Saku, as seen in post #3602969.

Her default attire is a plain white shirt and black skirt (alternate costume) or a school uniform comprising a buttoned and collared white shirt plus pleated plaid skirt (main costume), sneakers, and a panda hood.

This tag implicates sasaki_saku (learn more).