Yes, best to call this (Jamie’s) a belted plaid (essentially a wearable blanket). They are sometimes called Great Kilts, which can be confusing. Modern kilts are tailored and ready to wear. Plaids are only large pieces of fabric.

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The one Jaimie is wearing is called the ‘Great kilt’ and is usually 8 yards of material. This was really the way you had to put them on, and they were very serious about those pleats. The more modern kilts are around 5 or 6 yards, depending,and they make them for different seasons and purposes (utility/cargo etc) too now.