shell suit

/SH EH1 L S UW0 T/
noun
  1. 1

    A lightweight tracksuit consisting of a zip-front jacket and matching elasticated trousers, each having an outer nylon shell, often bearing panels and flashes of different colours, and inner cotton lining; popular in the late 1980s and early 1990s both as sportswear and as general leisurewear.

Source: https://en.wiktionary.org/wiki/shell%20suit