What is the fault? We really can't tell, each garment has a different minor fault. But one thing we can tell is that it is minor and hardly noticeable. Rest assured that if you don't like the product or think it is more faulty than you had thought - simply return it under our legendary "30 Days No Questions Asked Money Back Guarantee" Classic collar  Three-button placket  Short sleeve Flat knitted cuffs Hemmed bottom Fabric: 100% Cotton