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Tip: if you want to look more alien-esque rather than a robot, try to do some cool effects with your makeup. Check out this video tutorial for some ideas.
You could also try to find some green clothes instead of silver, but while I was shopping silver was MUCH easier to find.
Check back soon for some more Halloween costume ideas! :) Let me know if you have a suggestion or let me know what you are going to be this year!