right up one's alley

(right) up (one's) alley

Ideally suited to one's interests. Anna loves watching movies, so I'm sure she'll go to the film festival with you—that's right up her alley.
See also: alley, up

right up one's alley

Also, right down one's alley. In one's specialty, to one's taste, as in Writing press releases is right up her alley, or He loved opera, so this program of arias was right down his alley. These idioms use alley in the sense of "one's own province," a usage dating from the early 1600s. [First half of 1900s] Also see cup of tea.
See also: alley, right, up