If you're going to be a bum, you could at least do it with a little more finesse than wearing a Forever Lazy. These ones come in all type of prints, colors and fits (even a 'slim fit', and childrens sizes).
Would make for a good xmas present.
See more on One Piece's website.
If you want to try before you buy, there's a One Piece shop in LA, and
overseas in London, Stockholm, etc.