The Wellington Sevens is an international seven-a-side rugby tournament known for the fan's costumes and party atmosphere. In fact the costumes and partying are probably a bigger draw card than the games.
Here's a news article on a costume made by a fan to wear at the 2015 event:
[URL="http://www.stuff.co.nz/dominion-post/news/64152931/Sevens-getup-from-another-planet"]http://www.stuff.co.nz/dominion-post/news/64152931/Sevens-getup-from-another-planet[/URL]
I love the video of him wearing it through down town Wellington. Great costume, to be honest he won't look so out of place in the crowd.