Peter Millar Men Button Up Shirt XL Blue Plaid Pocket Short Sleeve Collar The Peter Millar Men's Button-Up Shirt in XL size and Blue Plaid pattern is a versatile addition to any man's wardrobe. Made from cotton with a woven fabric type, this short sleeve shirt features a collared neckline with a button-down style. The shirt is designed for a casual occasion, with the added accent of a pocket detail. Ideal for all seasons, this Peter Millar shirt combines style and comfort for the modern man.