from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of blue sleeveless shirt worn by sheep shearers and labourers.
After the gun shearer John Robert (“Jacky” or “Jackie”) Howe, who in 1890 set a long-standing world record by shearing 321 sheep in 7 hours 40 minutes. He is said to have worn a shirt with the sleeves cut off. (Wiktionary)