1878 Apr. 295/1 The skirt is..bordered with a flounce en coquille.
1882 S. F. A. Caulfeild & B. C. Saward 197/2 En Coquille. The French term to denote ‘shell-shaped’. The ribbon or lace is laid like a succession of scallop-shells, one above or over the other, in groups of threes.