shoulder-knot

noun3

1. •
   A similar ornament of other materials worn on a military dress uniform.
2. •
   (historical) An ornamental knot of ribbon or lace worn on the shoulders of fashionable men's jackets, especially in the 17th and 18th centuries.

   • ‘May I?’ she whispered, smiling round into his face. His shoulder-knots just perceptibly rose. — 1911
3. •
   A moth bearing a resemblance to such ornaments.