Knapp Cotton Twill Sport Shirt (Pin Oak) Double Ladies Watches with Changeable Bands and Bezels Set 10 Faux. The Knapp Cotton Twill is a classic autumn and winter twill. Made in Portugal from 2. 95oz 100% cotton twill, the Knapp is a traditional mens sport shirt is we created as part of the collaboration with Ducks Unlimited. The Knapp has an updated, classic fit that splits the difference between the oversized shirts of yesterday and todays too slim tailored fits. Outfitted with a button down collar, chest pocket and adjustable two button cuffs, the Knapp Cotton Twill Shirts are complete with a nod to the roots: a contrast bottom button hole inspired by Alabama red clay.