The Fresh Prince Of Bel-Air: Someday Your Prince Will Be In Effect – Part 1
Series 1, episode 8 from 1990.
Hilary is organising an Halloween party and so the family go to the mall to buy costumes.
They go their own way, Hilary and Ashley go clothes shopping, Will and Carlton try to get a date, Vivian gets engrossed in singing and Phil also gets sidetracked.
There are several clips from previous episodes inserted.
Movie pages here.