Made the way blazers used to be made
Blazers used to be made with sturdy fabrics and proper internal structure. That gave them a clear shape and a certain weight when worn. Many blazers today are made lighter and simpler, which often makes them feel flatter and less defined compared to older styles.
This blazer is made with that earlier construction in mind. The fabric is firmer, and the structure is built into the blazer itself. As a result, the blazer has a clearer shape and holds it while wearing it. It looks like a proper blazer, not a thin layer meant only for appearance.