is an adjective for anything commissioned to a particular specification. Now isn't that just the world of any worker of wood earning a living? A slang-related term ‘modding’; mostly used to refer to personalization after manufacture.
The word bespoke is derived from the verb to bespeak, to "speak for something", in the specialize meaning "to give order for it to be made" or commission. The term is definitely more prevalent in British English; American English tends to use the term “custom”.