Originally Posted by jyasaki
Can't you have a sheet metal guy make up new clasps, and use it as an extension to lengthen the straps that way? Or, with some nylon thread and a heavy duty sewing machine, add to the existing straps? (On that note, a decent sailmaker could do it by hand in an hour. Probably a lot less. It would take me considerably longer, and it would come out looking ugly, but it would work.)
A bit of rope would probably give a bodge, but to my mind there is something intuitively wrong with modifying a lifejacket. Unless the manufacturer supplies an extension strap I'd be concerned that the bladder would no longer be held in the right position to be effective.
Now the oil industry guys in Aberdeen aren't known for their svelt physique, so I'd guess it's the same out your way. Perhaps they could assist with your "procurement"? Or if I recall you did some work on a commercial vessel, who presumably have to accommodate your stature - could that PPE be borrowed whilst weight watchers set up their Falkland branch
a delivery arrives?