Vintage Big Mac flannel shirt from the 1960s showcases a classic grey and red plaid pattern on a Sanforized cotton fabric. This long-sleeve workwear staple features a button-front closure, two chest pockets with diagonal plaid detailing, and a pointed collar. The heavy-duty construction reflects its heritage as a durable utility garment, perfect for layering in cooler weather. Notable wear is present along the collar edge, consistent with its age and authentic workwear history.