This is a set of clothes or accessories for figures.
Adapted from the GoodSmile website:
Presenting hammocks for your Nendoroid series figures!
The Nendoroid More series was created to make Nendoroids even more enjoyable! The next item in this series is a collection of colorful hammocks! The hammocks come in three different colors: pink, orange and green. Enjoy displaying your Nendoroids relaxing the day away in these adorable hammocks!