I can no longer bear to wear an odd jacket (and particularly a tweed jacket) with jeans. The overall look of odd-jackets worn with jeans has become such a tiresome, commonplace replacement for 'informal style' that it is ubiquitous. All around me in this city men put on a pair of jeans and shirt then throw on a jacket and perhaps say to themselves: "Now I'm all dressed up!" You're not chum, you're wearing a jacket over the same clothes in which you: sit down to dinner, go to the supermarket, meet your friends at the pub etc... All too often it's a dull, blue or grey SB jacket in a 120 worsted, so no texture, just smoothness and even more like half a suit. Many RTW jackets have jetted flap pockets rather than patch pockets to help increase the informality. I honestly believe that many men have actually become fearful of wearing real trousers informally and so keep defaulting to jeans and those hideous 'khaki' abominations, for all situations.