Twitter was abuzz with comments about the fact she looks quite like she was wearing a shredded bin liner.
A fellow party-goer even asked her if that's what it was made of.
Other Twitter fans slammed the look for being rather reminiscent of a certain CBBC show.
A number of people couldn't help but Tweet her, "Raven want's his clothes back", with pictures like this one.
Not one to steer away from a fight, Phoebe made it simple by telling everyone the designer and that they were all simply fools.
What did you think, Primark-wearing heathens or just pointing out another moment when Phoebe's style gets too much?
Phoebe's Gareth Pugh?
Totally absurd - she looks like a birdAt least she looks differentNormally I quite like her vibe but this was a step too fash
Totally absurd - she looks like a bird53.06%
At least she looks different22.45%
Normally I quite like her vibe but this was a step too fash24.49%
MADE IN CHELSEA SERIES 6: STEVIE GETS THE GIRL
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MORE FASHION - THE GOOD AND THE QUESITONABLE