COS men’s size M dark blue button-down shirt in a twill weave, with long sleeves and a regular fit. The twill gives the fabric a subtle diagonal texture and a smooth, structured look that suits both smart-casual and everyday wear. It works well for office days, dinners, weekend outings or layered under a jumper or jacket, and pairs easily with chinos, denim or tailored trousers. The button-down collar keeps the look neat and understated, in line with the minimalist approach the brand is known for. The regular cut sits neither slim nor oversized, making it a practical wardrobe staple for anyone who wears a medium. It is pre-owned and in good used condition with gentle signs of natural wear, and no specific flaws have been listed. Full measurements are shown in the listing photos, so please compare them with a garment you already own to confirm the fit. Please check all photos, measurements and the condition details before buying.