kurusu natsume (old design)
The original default/debut costume of Nijisanji's Kurusu Natsume, as seen in post #3731988.
It consists of a strapless black dress with a detached collar, brown elbow gloves, black corset, black skirt, grey belt, and black knee-height high heel boots.
This tag implicates kurusu_natsume (learn more).
