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Under Depending On The Writer, we have the following entry:
"In "Suited for Success", Fluttershy's knowledge of fashion is revealed as her Hidden Depths. However, eight seasons and several script editors later, it seems to have been forgotten."
I suggest this be moved to a YMMV page as this isn't necessarily something the writers forgot as a demonstration of Fluttershy's lack of specific knowledge of the merchandise and panicking under pressure.
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How well does it match the trope?