The young daughter of a friend of mine said, "I think 'suit yourself' comes from a lazy tailor," which cracked us up. It also got me wondering.
I did the obligatory google search and came up with lots of discussions as to its meaning (even though the search was on 'history of..' or 'origins of…'). Even on our lovely Stack Exchange we have a great discussion about meaning.
Anyone know where/how it originated? If not, I'm going to endorse the 'lazy tailor' story just because it tickles my funny bone.
Best Answer
The OED gives the pertinent meaning of suit as:
Therefore 'suit yourself' is just another way of saying 'please yourself'. It's not metaphorical.
The OED also has an entry for the phrase itself: