Unbewigable
When a person's wig is so volumous, it's practically detached from their head, so much so that it now looks like a hat, but that person expects you to believe that it's their natural hair.
"OMG, it's so unbewigable!"
"You're unbewigable!"
"Is that a wig, or is that extensions? It's unbewigable."
"You're unbewigable!"
"Is that a wig, or is that extensions? It's unbewigable."