SnootyEnglishman said:
The Buddha shirt? Questionable but the image of a fat Buddha has been around for a while and most have gone with it.
To start this isn't so much directed at you specifically as much as clarifying in general because some people seem confused about this particular depiction.
As one or two others have said the laughing (fat) Buddha is not the same person who founded Buddhism. To be a Buddha just means to have achieved enlightenment, breaking the cycle of reincarnation, moving on to a higher existence and such. I suppose the term can be thought of a bit like someone being declared a saint in Christianity, but not exactly since they're seen as god like (though being a Buddha is not the same thing as being a god, there are also gods in some Buddhist traditions which I'm not even going to try to explain cause I'm hardily the person to try). There are several figures recognized as Buddhas within Buddhism, which differs from country to country.
The laughing Buddha is from China. The reason he's shown as fat is steeped in Chinese culture. Depictions of historical figures and such weren't always about being accurate for them as much as using certain cues like color of skin (some dudes are said to have had blue or red skin in myths), long ears, being heavy and so forth to tell you about the kind of person they are meant to be or ideas they represent. It's possible the monk the laughing Buddha was based on was actually fat, I dunno really off hand, but it's also short hand for prosperity in Chinese culture.
The western world thinks of the laughing Buddha as
the Buddha because he pretty much took the place of the original Buddha as the foremost image of Buddhism in China and Japan, amongst other places. Whereas India, and again other areas, have for the most part retained the enlightened (skinny originator of Buddhism) Buddha as their preferred depiction. It's easy to see why people get confused about it here since it makes perfect sense to refer to either as Buddha, though the founder of Buddhism is often called the supreme Buddha I believe.