I would use a OLFA rotary cutter and straight edge. Basically all you need to do is cut two inches from the bottom all around. I would carefully measure up from the hem and mark it with a gel pen. The markings can be removed with a bit of spit. Test first. I would cut it with the pleats closed you can then cut straighter, if you splay the pleats out there will be a curve you will then need a flex curve guide to cut a smooth cut.
The front apron does have a false hem, but I don't think you need to replace it, but if you wish you can glue a 1" strip from the waste.
If you wish you can ask a shoe repair or even some drycleaners will have a machine to backtack each pleat and you will be good to go
Cheers
Robert
(I make leather kilts so I know what's involved)