There is the chaperon which is the head and small cape contraption you see on medeival peasants. Later they started wearing it as a hat and it became a complicated headgear over the centuries.
Then there are capes and cloaks for foul weather.
Then you have hose for both men and women for leggings. Let's not forget the codpiece. You also had Breeches which are tight fitting (although sometimes flared at the hips) and only going to the knees as opposed to trousers.
If you will check Canonfire.com, you will find a series of articles on clothing in the Greyhawk setting, adapting actual clothing from the middle ages and renaissance to Greyhawk's history and various cultures. This is the "Fashion in the Flanaess" series. Just use the search function in the upper right of the Canonfire homepage to search for "fashion." There are 10 or so Fashion in the Flanaess articles.