Talk:Edd/@comment-26897822-20151224172108/@comment-25367317-20151224181552

Though there are a few canonical clues (or potential clues) about what could be under there:

Edd was seen wearing it in his youth and in his elderly years; while not a reveal, the very fact he was wearing a hat for almost his entire life could be a clue in itself.

Eddy was able to blackmail Edd into helping him get revenge on Kevin with the secret of his hat.

He has been shown to store things in his hat, including a label maker, hairpins, a jar of olive pits, even Eddy and Sarah have hidden in there.