This is a vintage Seattle Mariners MLB satin varsity bomber jacket from the 1980s. Made by the brand Felco, a New York-based sportswear company founded in the late 1930s that became an official supplier for Major League Baseball (MLB) and other professional sports organizations in the 1970s.
This jacket has a size Large on the tag, but please see measurement photos for sizing reference.
NOTE: there is a mark on the right shoulder, and a scrape on the mid back. These are hard to notice but I’ve attempted to show them in the final two photos.