Mo's going as a zombie cosmonaut Martian killer.
Sozlet's a supernova.
This involves a giant sparkly skirt (base layer of a regular skirt, then a hoop skirt over that, then a tulle underskirt over that, then a gold lame skirt over that, then a glittery tulle top layer -- when I say giant I mean giant, going on spherical), a dark-blue long-sleeved top with "Supernova" spelled out in sequins and beads (it was supposed to say "I'm a supernova" as per her request but I couldn't quite make it fit), and fiber optic thingies in her hair (which will be in an explosive high ponytail and maybe spray-painted gold), and abstractly shooting star-ish sparkly earrings, and a matching necklace she may wear as a headpiece instead.
I think that's it.
Hoping the weather will be nice enough that she can put fleece pants on under the ginormous skirt and be warm enough and not cover the supernova shirt, but we'll see.
Oh and body glitter.
Lots of gold sequins throughout.
I have all of the materials and everything planned out, and all but the "a" done on the shirt, gotta get cracking on that skirt though.