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. This course seemed right up my alley when I signed up for it, but it ended up being dreadfully boring.
See also: alley, right, up
Farlex Dictionary of Idioms.

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
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • right up (one's) alley
  • right up one’s alley
  • right up one's alley, to be
  • right up your alley
  • right up your street
  • up your street
  • (just/right) up (one's) street
  • be (just/right) up (one's) street
  • be up your street
  • be up (one's) alley