I know its wrong. I should know better. But we all slip sometimes.
Don't worry. I'm not going to use the fact that Fred Astaire was known for this in a misguided and arrogant effort to compare myself to such a sartorial giant. But when I think about it, I remember Harold Simon doing this all the time, as did a number of other men of traditional style who possessed a bit of flair back when I worked at a men's shop in high school. My point is, this wasn't so uncommon as we'd like to think. It may be against the rules, but it can add a nice quirk to an otherwise conservative outfit. In the eyes of any clothes nerd nit pickers you might run into. Truth is, 99% of people you meet won't care, or even know the difference anyway. (the jacket is double breasted with a center vent too, will the sacrilege never end?)
p.s. the Shop is stocked with new items. As for other things I should know better about, I've put up some serious heavyweight vintage Winter camping gear I just found, when any sensible store would be stocking Spring/Summer. Like they say, though, the time to buy an antique is when you find it. Lot's of seasonal stuff there too. Check it out.