This is actually not a glitch like some players think it is. This is an intended feature of the game. Whenever you save an outfit to your avatar's collection, you see a name that you can give it. You can name it whatever you like, such as Pageant Princess, so that you know what it is for and so on. The problem with this is that there is a really easy way to swap to these preset outfits. This is by, you guessed it, typing the name of the outfit into the game itself. So, if you pick a name that is quite common like "love", then saying love in the chat at any point will change your character's look to that particular outfit. This can make the game quite frustrating at times so be sure to be a little bit more specific in your outfit names to avoid this problem.