Vintage flannel shirts, starting at $9.99. These are recycled one-of-a-kind items, so only one of each is available for purchase. Most of our vintage flannel shirts were originally manufactured for men, but women often wear them for an oversized look. The size listed is according to the manufacturer’s original tag, but with vintage items, sizing varies depending on the brand and era. The best way to estimate how a particular shirt will fit is to compare its measurements with measurements of your own clothing.