Name a episode that Gumball is naked ?

The dress, because Richard made Gumball's clothes became tiny and he couldn't wear it. At last, Richard gave him Nicole's wedding dress and a moment later, Darwin saw Gumball was wearing the dress and he thought that Gumball was a girl so he felt in Liebe with him. Then Gumball had to take the dress off so at the end, he had no clothes left and he was naked. OMG, all of this typing is making me tired :O

The dress