When it comes to alphabet parties where you have to dress up in fancy dress beginning with the letter O, we have you covered here on Joke.co.uk. Although it's a very difficult letter to pick and there aren't many characters, movies or objects inspiring letter O costumes, there are still a handful of excellent ideas that will make you stand out at the party! Our letter 'O' fancy dress includes character costumes such as Olaf from Disney's Frozen, Oktoberfest German Bavarian Costumes, Obi-Wan Kenobi from Star Wars and the Transformers' Optimus Prime robot (for kids!). We're sure you'd agree that these are all cool options for outfits! For ladies that want an alluring and sophisticated look, how about dressing as an Olympic Goddess? 'Olympian Greek Warriors' is a noble alternative for guys and combined together they make a great couples costume theme. If you're going to the party as a group, paint all of your friends bright orange and roll into the disco dressed as Oompa Loompa's from the Willy Wonka and the Chocolate Factory movie. Alphabet parties are a fun theme for special birthdays, student nights out, sports socials and any other type of event that demands a challenge and quirky ideas from guests. Find all of your letter O costume ideas here and get ready for the party with us!