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 :
Soft to remap the key of the keyboard
Keyboard to a typewriter machine
Mario Bros interface
Examples of Hard and soft connections
website for keyboard interaction :