- Men’s white shirt - Monaco collar, long buttoned sleeves - Slim fit, pure linen - Buttons to fasten, IKKS button on left cuff - IKKS #actforbetter: fabric contains pure Masters of Linen® and European Flax® certified flax When it’s hot, what’s your best team mate? A linen shirt. Choose it all in white, with raw jeans at the office, and blue Bermudas for a weekend at the sea.