Perhaps you are having a fancy dress party and have invited your guests to wear Letter O Costumes or maybe it's one of your initials? Regardless, here you can explore to find some fun an unique costume ideas for your fancy dress starting with the letter O theme. Outfit suggestions that start with O range from various bright orange things to Wizard of Oz characters. A costume in outrageous orange is sure to stand out from the crowd. You will be surprised at the number of costume possibilities this shade can offer. Orange Morphsuits, pumpkins and even Oscar the Grouch. Be original and outrageous in one of our Letter O costumes.