I'm gonna have to keep up with this thread I think. I'm female but with very tiny boobs. Fortunately, none of my cosplays I'm interested in right now are that busty, but that doesn't mean I won't ever want to do a character like that!
Princess Luna gijinka (MLP)
Agatha of Woods Beyond Ball Gown (The School for Good and Evil)
TARDIS (Doctor Who)
Up for consideration:
Kimono version of Elsa's ice dress (Frozen)
The 'Patchwork' girl from "Beautiful People" by Mitsukazu Mihara
Pre-bite Ginger Fitzgerald (Ginger Snaps)