US, Australian and NZ another name for sports jacket
Sports Idioms That Will Explain EverythingJumping the gun means starting a task too early, usually culminating in a disappointing outcome, or worse having to start over.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for sports coat
The doorman was having a cigarette with a guy in a sports-coat who was wearing a manager badge on his lapel.
Freddy kept chewing, but he dug in the pockets of his sports-coat and came up with a small stubby notebook and a ball-point.