This is a set of clothes or accessories for figures.
From the GoodSmile website:
More cute display options for your Nendoroids with this fourth set of decorative parts!
The Nendoroid More series was created to make playing with Nendoroids all the more fun, and this fourth set of After Parts accessories are here to do just that! This set includes rabbit and kappa cosplay items together with a carrot and cucumber to hold! Dress up your Nendoroids for all sorts of new display options!