Adult Link (from The Legend of Zelda; Ocarina of Time)
Simply find a green T-shirt, tight-fitting white pants, white long sleeved shirt to put under green T-shirt, and green hat like Link's. The hat may be hard to find. If necessary, buy a Santa hat, dye it green, and cut off the tuft on top and the fuzz at base. Dye hair blonde if not blonde already.
Note: Costume for men 15 and up.
Young Link (from The Legend of Zelda; Ocarina of Time, Majora's Mask, and the Wind Waker)
See Adult Link costume above, as it is exactly the same.
Note: Used for boys around age 8.
Thanks to Mac for this great idea.