Beta Hat T-Shirt

The Beta Hat T-Shirt is a body item unlockable from the Treasure Book. It is rare because you need five Series 6 plush toys to access the "Super Exclusives" area of the Treasure Book, where it is.

Trivia

 * It is unknown why the name is Beta Hat T-Shirt, rather than Party Hat T-Shirt, since Party Hat is the official name, with beta hat being unofficial.
 * Many players pretend to be Beta Testers when they wear this item.
 * It has the party hat colors which are pink and yellow.
 * Despite many rumors, this item does not make the penguin a beta tester, nor does it give the Party Hat.
 * There may be t-shirts based around other Party Hats in the future, but this has not been confirmed.