When you are trying on a black suit , make sure that shoulders fit as the shoulders can be the most difficult and expensive to tailor. For this purpose lean against a wall and make sure the shoulders of the jacket don't touch the wall before your shoulders do. A perfectly stitched jacket has no shoulder divots or upper arms wrinkles. Your Jacket sleeves should expose about half an inch of your shirt cuff. Your Jacket should be long enough to pass the top curve of your butt, and ideally, reach where your butt starts to curve inwards. Your Tie width should match the lapel width Your Tiebar should not be wider than the tie Go for a more versatile navy blue suit rather than black. Reserve Black suits for funerals Wear an undershirt if you sweat a lot When you sit down, always unfasten the buttons on your suit to prevent damage. Match your belt color to your shoes.