A "tweed suit" refers to a type of clothing that is made from a rough and warm fabric called tweed. It usually consists of a matching jacket and pants, typically worn by men, especially in more formal or professional settings. Full definition
The Duchess attended a post-Christmas service at St. Mary Magdalene Church in a sophisticated, tweed suit by Michael Kors, adding a royal blue hat and gloves to complete the look. (goodhousekeeping.com)
This lovely 1980s Rive Gauche green herringbone tweed suit jacket by YVES SAINT LAURENT has a jacket with two front slashed pockets with buttons, shoulder pads, tailor seam, two - piece s... (1stdibs.com)
I'm sat here with mine on now funny enough and they are being worn with my vintage tweed suit of waistcoat and trousers. (fakefabulous.com)