You can ignore the caloric content needed to constantly make an actual lady-suit of your flesh and instead just focus on the fact that it exists at all. Every time she uses her power, she must be leaving several pounds of loose skin on the ground. And since she wears a costume, she either needs to drop trou to fully extricate herself, or she's picking pieces like errant scabs and tossing them about.
Husk also does the process in reverse, so say she makes herself into a ham hero, then the fight against low cholesterol is done and she wants to turn back into a woman, she drops her ham husk on the ground, too. And in this single, fictional scenario I just made up, this is awesome because then everyone gets to have ham. But on the other hand, since we're just making shit up now, she could have just as easily turned herself into an olive and then leave an olive husk and who the fuck wants that? Now you have a The Silence Of The Lambs woman-skin suit laying around, plus like 5'6" of olive, too? No thanks.