This actually makes sense. The Behemoths are the oldest Super Mutants in the Capitol Wasteland, so, Overlords are the second oldest. We can assume that these are the original Vault test subjects, as opposed to wastelanders who've been changes in the last 10 or so years.
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The Trousers seemed to fit, so why not create a Upper supermutant Vault suit, with the sleves rolled up to shop off those Muscles?