coattails n. pl. (fig.) The influence of another person; the effect of association with another person; as, he was elected to office on the president's coattails.
on the coattails of
(a)
helped by association with another person. See coattails.
... loose blue cutaway and square hat above large slops crossed the quay in full gait from the metal bridge. He came towards them at an amble, scratching actively behind his coattails. ... — Ulysses • James Joyce