You will need.
1 x keyfob hardware [these are available for sale on ebay and other places online] If you can't get one of these, see this instructable on how to make one using a D ring
1 x medium weight cotton fabric, at least 27cm x 7cm
1 x fusible interfacing 27cm x 7cm
1 x fusible interfacing 27 cm x 3cm
1 x Cotton tape approx 3cm x 27cm [this is not adhesive, but a woven length of cotton available from a fabric store]
Polyester machine thread
Blunt nosed pliers