This is DeviantARTist Nyima-chan cosplaying as a Stargate. Pretty clever. The yellow chevrons around the gate even light up. That's a nice touch. Maybe for next Halloween I'll be a worm hole. Specifically: Earthworm Jim's anus. Everyone will ask what I'm supposed to be, and I'll tell them a wormhole. It will be funny, trust me. Granted I might not win the costume contest, but I guarantee I'll at least cause a scene when I don't.
Keep going for several more shots.
Thanks to carey, who's going to Halloween as a Star Trek transporter next year.