Sailor wearing sleeve buttons.

Reproduced from The Lewis Walpole Library Digital Collection, copyright 2012.

Satire called Jack Hove Down With a Grog Blosom Fever showing a sailor in bed with his fist raised about to strike the doctor. His raised hand clearly shows a pair of sleeve buttons.

A detail of Jack Hove Down With a Grog Blosom Fever, in The caricature magazine, or Hudibrastic mirror vol. 2, Folio 75 W87 808, by G.M. Woodward, published in 1811 but showing styles of the second half of the 18th century.Jack Hove Down With a Grog Blosom Fever..

See the complete picture on Wikipedia.