For most garments, a perfect fit has different meanings depending on their styles and cuts. When you are wearing a blazer, the seam should sit naturally on your shoulder and shouldn’t be too tight or loose. Check your collars too; they should rest against your shirt collar, which in turn must hug the back of your neck. Also, check for chest, waist, sleeves and buttons, all must be perfect for your blazer to fit you perfectly. Remember to check for the length of the blazer too as too long or short can break or make your overall look.