Sometime back in the 70's I needed a pedal strap and my local music store said they would have to order one...what do you do? What I did then is exactly what I still do today, I made one out of a dog leash.
A 3/4" dog leash makes the perfect strap and it is far better than leather...it doesn't stretch out, it doesn't get hard, and it doesn't change with the weather. It's sort of like comparing plastic heads to calfskin. It just makes a pedal feel lighter and faster.
Here is a quick pictorial on making one...a 6 foot leash will make 8 or 9 straps.