You may already have some ideas, but take a spooky ... First, using face paint, paint your skin a fun alien colour, like green or blue. Second, create your costume. You could be a green alien ...
Superhero Costume (e.g., Wonder Woman or Supergirl ... Add face paint for a fun, joyful look. Theme: Adventure and Western style. Outfit Ideas: A cowboy hat, boots, and a vest.