Need help with a gory horror story?

I am writing a gory horror story about five sixteen yearold girls at a slumber party. Pretty much your typical slasher story except I want the girls to die by their bras. Like, one girl would have her bra lit on fire while its still on her. But I need more ideas. Insects in bras will work, but just need ideas for deadly insects to use. Or anything that would kill a girl if in her bra would work.