the back of the skirt on a man's coat
one of the two back parts of the skirt of a coat
, especially one of the tails
on a tail coat
gained by association with another, especially with a successful or celebrated person: coattail benefits.
on someone's coattails, aided by association with another person: The senator rode into office on the President's coattails.
on the coattails of, immediately after or as a result of: His decline in popularity followed on the coattails of the scandal.