Wear Too Many Hats Meaning

(idiomatic) To try to fill more roles at once than is realistically possible.

Example: 1963, Cameron Dewar, "Too Many Hats for 'Jennie'", Billboard, 10 August 1963:
  She is asked to be a comedienne, dancer, stunt woman, singer and dramatic actress — and the truth is that she is trying to wear too many hats.
For more examples of usage of this term, see Citations:wear too many hats.