This from Debra D. Bass, fashion editor of Sunday's St. Louis Post Dispatch. See if you can tell where I quit reading.
"Simple spruce-ups for guys can put a spring in your step"
"Fitted unlined one or two button sport jacket: The key word here is fitted. In case you are wondering how fitted, if you can button it without taking a breath it's too big. Am I exaggerating? Not really. For one thing, this might not be a jacket that you ever need to button. But it shouldn't look like you're wearing a kids jacket. Most guys err on the too-loose side and it look sloppy. Make sure it fits your shoulders. If you can do a cartwheel without splitting your jacket, it's too big. But a great jacket is the right look to class up a fitted T-shirt and colored cotton pants or jeans, and it's a great switch from a boring sport coat."
Or in other words, dress from the back of your closet.