Peter Millar Men's Cosmo Excursionist Flex Stripe Sport Shirt Neiman Excursionist Flex Peter Millar Excursionist Flex Solid Sport Shirt Men's Sport Shirts Peter Millar Peter Millar Men's Soren Excursionist Flex Sport Shirt Neiman Marcus. With a softness that has to be felt to be believed, this sport shirt features a highly innovative cotton stretch fabric from one of Italys finest mills. The fabric reads like a classic lightweight Oxford yet wears like your favorite knit polo, with wrinkle resistance and travel ready ease. Finished with a cutaway collar, French placket, mitered cuffs and mother of pearl buttons.