Here is the item again:

You might think (A) that a floor-length dress is conservative (B) until you see the one that Christina wears. (C) A psychedelic swirl of pinks and purples that attracts everyone's attention.

You correctly realized that the period after wears creates a fragment. A psychedelic swirl of pinks and purples ... is an appositive, so it cannot stand alone as a complete sentence.

To fix the problem, you chose to do this:

You might think that a floor-length dress is conservative until you see the one that Christina wears. It is a psychedelic swirl of pinks and purples that attracts everyone's attention.

Adding It is gives the fragment the necessary subject and verb to make it a main clause.

Good job!

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