- Men's saffron yellow shirt - Monaco collar, long buttoned sleeves - SLIM shape, 100% linen - Button closure, IKKS button left cuff - IKKS #actforbetter: material containing 100% linen certified Masters of Linen® and European Flax® Liven up your summer wardrobe with a touch of saffron yellow. An original color that brightens up Men's 100% linen shirt.