I'm going to do Bremons pumpkin costume as such: Bikini top with smudged black paint on her tits, and orange shorts, with green paint on her tail to create a faux vine.
Demonias nurse costume will be done as such:
Partially open in front exposing her bra but still closed and visibly straining around her bloated form.
Lilliths mummy costume will be done as such:
Wrappings around the top of her head several wrappings around her upper torso with few spaces for her flesh to poke through as well as around her waist and legs, maybe a bracelet on her wrist.