The default costume/first school uniform of Nijisanji's Shizuka Rin, as seen in Danbooru post #3500206.

Her default school uniform, the "winter uniform", is a full dark blue school uniform (blazer, pleated skirt, and pantyhose), plus a collared white shirt, grey sweater, and purple bowtie underneath, and black loafers.

This tag implicates shizuka_rin (learn more).

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