Step 1: Gather materials
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
Step 2: Iron
b. Place large piece of fusible interfacing shiny side down on wrong side of fabric.
c. Check placement and iron interfacing onto fabric. It is best to cover the whole thing with a sheet of brown paper or baking paper to avoid melting the interfacing.
Step 3: Cut and mark
b. Measure exactly halfway on the 7cm edges [3.5cm] and mark with an erasable marker or tailor's chalk.
c. Measure exactly halfway on the 2nd piece of interfacing [3cm x 27cm], on the the short end as above. Mid point will be 1.5cm