ruche
noun
ˈrüsh 
variants or ruching
ˈrü-shiŋ
: a pleated, fluted, or gathered strip of fabric used for trimming
ruched
ˈrüsht
adjective 
Example Sentences
Recent Examples on the Web Painted in profile against a leafy background, the model, an actress known as Jane Demarsy, wears a floral pompadour dress, a cabriolet hat topped with roses and daisies and trimmed with a ruche, a dashing black scarf and long suede gloves. 
Washington Post, 7 June 2019
Washington Post, 7 June 2019 Word History
Etymology
French ruche literally, beehive, from Medieval Latin rusca bark
First Known Use
1806, in the meaning defined above