Bespoken appears to be the original term  before "bespoke" was used to mean custom-made. Its usage in that sense is now archaic and rare: 


***[Bespoke][1]*** (adj.):

> - "custom or custom-made, made to order," of goods, as distinguished from ready-made, 1755, ***the same sense found earlier in bespoken (c. 1600), past participle of bespeak***, in a sense of "to speak for, to arrange beforehand," a sense attested in bespeak from 1580s. Now usually of tailored suits.

Etymonline

[Ngram][2] *bespoke vs bespoken*


  [1]: http://www.etymonline.com/index.php?term=bespoke
  [2]: https://books.google.com/ngrams/graph?content=bespoken%2Cbespoke&year_start=1900&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cbespoken%3B%2Cc0%3B.t1%3B%2Cbespoke%3B%2Cc0