And in that context, though I have no way of assessing the dress choices of Sarkozy or Obama, I can say that if Cameron's wife is anything to go by, his sports jacket-and-chinos thing may be genuine.
Do I have to wear a suit to the dinner, or will a sports jacket be good enough?
A fur vest put on a sports jacket in rhinestones will be nice as home clothes.
He wore a tweed sports jacket of a greenish colour.
He was wearing a grey lightweight suit as opposed to his usual check sports jacket.
One person might understand casual to mean khakis and a sports jacket. Another might think it means a pair of jeans and tank tops…
The affable Keefe, a friendly smile on his cherubic countenance, was attired in a checked sports jacket and gabardine slacks.