pannier
US /ˈpæn.jɚ/
UK /ˈpæn.jɚ/

1.
2.
a framework, typically of wire or wicker, used to support the sides of a skirt or dress, popular in the 18th century
:
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The gown was supported by elaborate panniers, giving it a wide silhouette.
•
Historical fashion exhibits often feature dresses with prominent panniers.