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[figheadair]

Sorry, just to clarify, who exactly is depicted in this portrait?
(edit: Never-mind, I think it's Sir Alexander Macdonald 1744-1795. 9th Baronet of Sleat and 1st Baron Macdonald of Slate)
Also, his kilt looks to be pleated in the front. Was this ever common?

Nathan - you've answered your own question on the sitter's identity. He was also the younger of the pair of MacDonald Boys in the c1750 portrait.

Pleating all around was not common, especially by then but was not unknown earlier see below Lord George Murray c1745.