A Kilt is a knee-length skirt-type garment originating in the traditional dress of men and boys in the Scottish Highlands of the 16th Century.
Jamie McCrimmon spent his time traveling with the Second Doctor wearing his kilt, even when it was too cold to do so. (TV: The Highlanders, TV: The Abominable Snowmen et all)
When the Fifth Doctor was giving Erimem a tour of TARDIS, he told her the kilt in the wardrobe belonged to Jamie. (AUDIO: No Place Like Home)
Burrows compared Captain Kybo's uniform to a kilt (AUDIO: Judoon in Chains)