Thanks to many of the Fall collections, what was once the symbol for grunge is now the sign of aristocracy. That doesn't mean you have to throw out your flannel shirt, but for Fall, invest in some prim and proper plaid. This Banana Republic Silk Tie-Neck Plaid Blouse ($79) is the perfect place to start.
Of course, I wouldn't want you to look too prissy; I recommend pairing your pretty plaid with black stovepipe jeans and funky booties. If you don't want to buy a new piece, try tucking your grungy plaid shirt into a high-waisted pencil skirt. How does that sound?