Sometimes to create a project/interface and avoid to spend to much time about technical issues using existing element could be a nice way to prototype idea.

To create a simple computer interface an object like a keyboard could be perfect to hack.

You will create a simple interface with the computer but completely embed into a garment.

Useful link :
Another tutorial

Soft to remap the key of the keyboard

Emulator of arcade games

Ref :
Eight steps by kobakant

Keyboard to a typewriter machine
Mario Bros interface

Examples of Hard and soft connections 

website for keyboard interaction :