Lesson learned. Crisis resolved. Rarity's reputation and Saddle Row are both intact.

But the question remains, how did Fluttershy pull off all of those near-instantaneous costume changes? And just what was going through her mind at the time?

Well, there are a few mistaken assumptions in those questions, as quickly became clear once everypony got home...

Contains some spoilers for S8E04, "Fake It 'Til You Make It."