I heard about this phrase yesterday at a party.

Problem:
The modifier of “dress” is incorrect.

Explanation:
My friends Erik and Nickie F. told me yesterday about this phrase.

It seems that someone was trying to refer to a dress made of sewn-together sequins.

Apparently the originator of the phrase “sequenced dress” heard the plural noun “sequins” — spelled S-E-Q-U-I-N-S — perhaps mispronounced as the verb “sequence” — spelled S-E-Q-U-E-N-C-E — and then added a “d” to make it an adjective to modify the noun “dress”.

The potential for things to go astray in the English language never ceases to amaze me.

Solution:
“sequined dress”