This is a set of clothes or accessories for figures.
From the Good Smile Company website:
From the popular browser and smartphone game "Touken Ranbu -ONLINE-" comes kigurumi pajamas based on Konnosuke for your Nendoroid Dolls! The kigurumi is a onesie type with feet, and paw pads are printed on the bottom.
Note: Figure not included. *Please note that some Nendoroids and Nendoroid Dolls may not be compatible with this product.