Hazy memory, not least because we removed the kit when doors closed ready to go, and only wore AR5 on a couple of Tacevals a good few years ago... but I don't remember removing the LSJ, which I think I'd have rather spotted as we used to fly over water all the time, often at low level. So I'm fairly sure the LSJ was worn at the same time, over the top of the AR5 bits...
I also vaguely recall doing a dinghy drill in a swimming pool wearing it all, back when we were fitted for it, although I can't remember where we went to get it any more.
Dave