Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Slender

Slender as a cat’s elbow.
—Anonymous

Slender as a lath.
—Anonymous

Slender as a reed.
—Anonymous

Fair and slender as the pine tree.
—Serbian Ballad

Slender as a young poplar.
—Honoré de Balzac

How slender a tract, as scant as Alcibiades his land in a Map.
—Robert Burton

As slender in the middle as a Cow in the waist.
—Robert Burton

Like the hazel-twig
Is straight and slender.
—William Shakespeare

A girl tall and slender as a palm.
—Heinrich Zschokke