Bespoke, as the past tense of bespeak, is where the 'custom made' connotation arises from. In that form, in Georgian English, 'to bespeak' meant 'to order, arrange, or otherwise organize in advance.' For a modern but contextually correct example of this use, see Patrick O'Brian's The Mauritius Command volume of the Aubrey/Maturin novels. Dr. Stephen Maturin convinces his friend and family that they should accept his hospitality at the local inn by stating "Jack, I have bespoke dinner at the Crown. These dishes will be on the table at the appointed hour, and if we are not there, they will go to waste entirely." (O'Brian, Patrick: The Mauritius Command. New York: W.W. Norton & Company, 1991; p. 25).