Women might wear a skirt with a tartan pattern on it and that would still be a tartan skirt. You are probably thinking of a man's Highland outfit and that is called a kilt.
Tartan is referred to as plaid in North America incorrectly. A plaid in Scotland (the country where the pattern originated) is an accessory to the kilt (traditional Scottish dress). The woven pattern is called "Tartan" everywhere outside North America
Tartan is a regular plaid pattern in a fabric, usually applied to Scottish kilts.
The Scottish tartan 'skirt' - is called a kilt.
Tartan
The colorful pattern on a Kilt is called a tartan. different colors indicate different clans traditionally.
Generally, we think of tartan as the name for the cloth and plaid as the name for the particular pattern, but the words are often used interchangeably so that tartan can mean any checkered pattern and plaid can mean any checkered fabric. Plaid's original definition is 'as a woolen cloth having a checkered or tartan pattern'. It evolved to mean any such checkered or tartan pattern. Tartan's first definition is a 'woolen cloth woven in stripes of various colors at right angles to form a rectangular pattern; also, the pattern and design of such a cloth. Both words were first recored around the same, c.1500.
argyle
Tartan.
Anything - "tartan" is a pattern. Usually Scots tartan clothing is made of wool.
Tartan
Tartan.