dress rehearsal
noun /ˌdres rɪˈhɜːsl/
  /ˌdres rɪˈhɜːrsl/
 - the final practice of a play in the theatre, using the clothes and lights that will be used for the real performance- (figurative) The earlier protests had just been dress rehearsals for full-scale revolution.
- a dress rehearsal for a Broadway play