Old Navy Flannel-Lined Sherpa-Trim Jean Jacket in Medium Wash If the warmest winter coat you own is a denim one, upgrade with this Old Navy Flannel-Lined Sherpa-Trim Jean Jacket ($55) featuring a cosy sewn-in layer that's like wearing an extra shirt without actually doing so. Image Source: oldnavy.gap.com Old Navy Flannel-Lined Sherpa-Trim Jean Jacket $55 from oldnavy.gap.com Buy Now