Blazer vs Suit Coat Some people think that the terms blazers and suit coats are synonyms and that you can use them interchangeably. Others think that the only difference between the two is that suit coats come with matching pants. But the truth is a little more complicated than that. Blazers and suit coats differ in a wide range of important areas, which include shoulder construction, fit and formality.
Shoulder Construction The shoulders of blazers are constructed similarly to shirts, by simply attaching the sleeve of the blazer to the body of it. This provides the shoulders with a clean and simple look in comparison to a suit coat. It also provides a more relaxed fit in the shoulder area than a suit coat. The shoulders of suit coats are constructed entirely differently than blazers. They have small amounts of padding in both the shoulder area and the area where the sleeve meets the shoulder. This gives the shoulders more definition, shape, and contour.