People often ask us about the difference between sport coat and a suit jacket, with the assumption that there is a grand and unambiguous answer. The truth is, there is no significant difference between the two. The main difference is the most obvious one, a suit jacket comes with a matching pant. In terms of cut, some men will often be more adventurous with a tighter fitting, high armholed suit jackets than sport coats.  But in terms of material, sport jackets can and are frequently made using a cloth with much more decoration and design within the weave.