There seems to have been a fashion for lingerie trimmed with this crocheted lace during the First World War era. “Filet lace” is often recognizable by characteristic grid patterns, although quite complex shapes, such as butterflies and flowers, can be created. I know nothing about crochet and very little about lace, but I’ll post these images for those who do have an interest, especially since it may help to date vintage items.
Below, a different version of Butterick nightgown pattern 8552:
Collars and blouses were also a popular place to display crochet lace:
“Even the baby wears filet.”
Lace-trimmed jabots were also popular circa 1917.
Geometric, grid-based filet lace was not limited to the nineteen-teens; this spectacular display decorates the front and back of a slip that shows 1920’s styling.
It’s possible that the large piece of lace is machine made, but the straps are crocheted.
Filet lace was often pictured along with other forms of lingerie lace trim.
P.S. Happy holidays to all!