Looks like top part has been re-cut and stitched. I would probably just center the buttons and gather to tighten up a larger shirt.
Button-down sweatshirt with sleeve / cuff embroidery | Anthropologie // Ottod'Ame
*refashion inspiration* Contrast Striped Long Sleeve Tee OASAP.com
Personally smitten with the beautiful ruggedness of this blazer. (Lambswool & leather, paired with simple old blue jeans.) It's simple, yet it's a statement.
Embroidery by Trini Guzmán
Moonflower Sweater Jacket - anthropologie.com - remake with old red wool shirt