- Men’s cigar-coloured shirt - Mandarin collar, long buttoned sleeves - EASY-REGULAR fit, pure French linen - Buttons to fasten, IKKS button on left cuff - IKKS #actforbetter: fabric contains pure Masters of Linen® and European Flax® certified flax The partner for summer days in the linen shirt with a mandarin collar. Indisputably. It treats itself to a cigar colour from the palette of on-trend browns.