shirttail

Definitions

• The single or split (then rather plural) bottom part of a shirt, below the waist, especially in the back, which, when not tucked into trousers or other vestment, hangs over the wearer's tail-end, like a tail.
• (by extension) The tail-end or periphery of something.
• A tenuous connection.
• A distant kinship.
• A small portion
• Something small and unimportant.