A "pinstripe blazer" is a type of jacket, usually made of a structured fabric with thin vertical lines called pinstripes. It is typically worn as part of a formal or business attire. Full definition
I paired a white pinstripe blazer with my new favorite jeans and a gucci belt. (thegypsyfiles.com)
If you prefer a matching set look, the burgundy blazer also comes with a matching burgundy pencil skirt and the ruffle pinstripe skirt comes with a matching pinstripe blazer. (laceandlocks.com)
The suit and bridesmaids Ewan was very determined to feel like himself on the day, and wore smart jeans, a rather natty navy pinstripe blazer over a white shirt with his Granddad's cuff - links, and his beloved trainers. (boho-weddings.com)