Yes. It is, not only because of the dress only but also because it was being used by the main pop star at her peak. Bjork's dress was bigger than herself, for example.
People don't even know who Lil Kim, yet know what dress she wore (which I don't even know what you're talking about), and this isn't shade it's the truth.
People don't even know how to pronounce Bjork's name.
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Yes, Gaga's meat dress is the most iconic dress of all time.