If this ever comes up again, here are couple of things about survival suits to think about when buying used.
1: Zippers: We waxed our zippers every year in Alaska. The zippers, if neglected, will jam and if your zipper won't function, you're dead. So, make sure to give it a dry run. Actually put it on, don't just work the zipper without tension on it.
2: There are different types of gumby suits, some have boots built in and gloves that break at the wrists so your hands can be free. We called these "captain" suits. We were told that they were designed because the captain would never put on a floppy suit before the boat went down because he was usually trying to save the boat. If you don't have a captain's suit, put a couple of plastic shopping bags in the hood of your suit when you stow it. If you have to use it, slip the bags over your shoes so they can slide through the legs. If you don't you have to take your shoes off or you can't get the suit on. Dragging yourself onto a rocky shore with no shoes after abandoning ship is a definite factor against survival.
3: Put them on before the boat sinks. I know this sounds obvious, but a lot of crew waited too long and didn't factor into the equation that boats don't go down in a nice, linear sink. She can slowly take on water for quite some time, and then 50% of the boat can suddenly disappear in a few moments. Put the suit on before you think you need to.
If you have access to a swimming pool, try putting on your suit in the water. It can be done, but it's ridiculously hard. Doing it in waves or very cold water would be almost impossible.