A suit is "bespoke" as opposed to "tailored" or "custom made" but that doesn't mean any of them is "bespoken…”
I think a “bespoke” suit is one that will be spoken about before completion, in the sense of discussing all the little details. It hasn’t yet been stitched, so it can’t be seen on the hanger.
I think a “bespoken” suit is one that has been spoken for already, in the sense of having been reserved. It might be hanging on display but it’s already been sold.
I thought “bespoken” might also be heard in furniture showrooms or on garage forecourts and that rather obviously, the other main use of that tense was in marriage contracts: a man, more usually a woman “bespoken” was a more poetic, romantic or more formal, albeit rather archaic option for the modern “spoken for” but pride goeth before a fall…
Asking Google for examples revealed “bespoken” to be so obscure, the only useful hit I got was from an anthropological study of the African Bemba, Seven Tribes of British Central Africa, by Elizabeth Colson, Max Gluckman (1951)
On marriage customs of the Nyakyusa of South-Western Tangankyika we read that “A girl who is bespoken in infancy does not, ideally, go to live altogether with her husband till after she has reached puberty...”
In the sense of software development, I certainly heard the term “bespoke software” along with "bespoke solutions" in daily use for years among developers, vendors and users before, for instance, Apple’s Lisa came out in 1983 or the Edsel Apple III in 1980 though perhaps not before the Apple II in 1977.