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In page Trousers as women's clothing:

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Many forms of dancing require females to wear skirts or dresses, either by convention or competition rules. In Scottish highland dancing, for example, women do not wear trews, but instead either wear a skirt or dress including the Aboyne dress (for the national dances) or the kilt-based outfit for the Highland dances. However, tartan trews can be worn by women in the United States.[citation needed]