In reply to TobyA:
It's more my newest harness that's pissed me off as it's less than two years old and the elastic is shot. I have the previous model of the harness, probably about 5 years older and the legloop elastic is fine.
More recently with several newish jackets the draw cords have perished. The same elastic cord has gone on my Gourden rucksack too yet, I have old bungee cord from the 1970's which is still OK!
Also two pairs barely worn stretch Cordura trousers have gone from a 30 inch leg to a 36 inch leg - either that or my legs have shrunk!!!