Stories of giants -- incredibly large humans as big as mountains -- have been told throughout history. Homer's "The Odyssey" described large, one-eyed giants, or cyclops, while other tales, such as David and Goliath from the Bible, and Roald Dahl's "BFG", portrayed giants as massively large versions of human beings. If you want to inhabit the role of a giant for a night, consider making a giant costume based on the most well-known version of the giant -- a medieval dunce carrying a bludgeon.
Find an oversized, long-sleeved, button-down shirt without a collar. Gather up a large piece of felt fabric and cut a hole in the middle large enough for your head to fit through. Depending on the distance from the base of your neck to your shoulders, create a wide fringed piece that can rest on your shoulders. This will act as an extended collar to cover about four to six inches from your neck to your shoulders and around. The resulting piece should look like a very short poncho. Leave enough space between the neck hole and the remaining fabric so it extends to your shoulders.
Pull on a pair of tight trousers or leggings. Slide your feet into a pair of black boots that come up to your knees. Tuck the trousers inside the boots.
Wrap the belt around your midsection, so that your oversized shirt extends past your hips.
Stuff the shirt with whatever fabric you can get your hands on. Use small pillows to fill your stomach out and add fabric to your arms to make them look muscular.
Find a bludgeon, or medieval club, at a costume supply store. Also find a small action figure or small plastic doll. You will carry the figure in your hand to demonstrate how large you are by comparison.
Mess up your hair to look scraggly and dirty. Smudge some brown makeup on the creases of your face. Using brown-colored eyeliner, add stubble around your mouth and along your jawline.