For those of you who live in much colder areas, the shirt jacket can be just as useful. When things get real cold outside and your peacoat just isn't doing it, the shirt jacket can be a seriously warm middle layer. Odds are its plaid print will stand out against your dark outerwear (much like a plaid scarf), so it'll look pretty good as it gets the job done.
Shirt jackets, or really heavy shirts (often lined) that can function as a lightweight jacket, are pretty easy to find from most of the usual suspects. No matter what you're into you can easily find a shirt jacket that syncs up with your current wardrobe (I'll be the first to admit that red and black buffalo check is not my thing). Most are made of a heavy duty fabric, such as wool, and will often come with a unremovable liner. The extra fabric adds warmth, no doubt, but this comes at a price. Most shirt jackets are going to run you in the $100 and up range, but when you consider how it can replace a $300 jacket, it pales in comparison. Here are some options to considering adding to the weekend rotation...
L.L Bean Washable Wool Jac-Shirt...$59.00
L.L. Bean Lined Allagash Shirt-Jac Buffalo Plaid...$89.00
Filson Jac Shirt...$155.00
J. Crew Buffalo Check Shirt Jacket...$98.00
Woolrich Woolen Mills Ranger Shirt Hombre Wool...$225.00
Pendleton Westwood Shirt Jac...$158.00