Considering the number of ripoff Spiderman accessories people are shown with in the Marvel U, I'm willing to believe that's a nightie. :) And I'm not a lesbian (I'm not, I'm not!) but I am fond of ladies wearing drapey Spider-man shirts.
The scene and her buckteeth, though, got me flashing on Bugs Bunny and Daffy Duck in the Forty Thieves treasure cave. :)