from The Century Dictionary and Cyclopedia
- n. Something formed like a sparrow's tail; a swallowtail.
- Having a long skirt cut away at the sides and squared off at the end: as, a sparrow-tail coat (now usually called swallow-tail).
Sorry, no etymologies found.
He drew Charley aside, and asked him why he did not tell him that those sparrow-tail things had come into fashion again!