Fake It 'Til You Make It

Fake It Til You Make It is the fourth episode of season eight of My Little Pony Friendship is Magic and the one hundred and seventy-third overall.

Zap2it
"Fluttershy looks after the Manehattan boutique while Rarity is away. She takes on a series of characters to cope with the intimidating clientele and learns that she was already the best pony for the job just by being herself."