I'll be the one dissenter here. I'm not that fussed over the PJ's (I will take them to give away if they are handing them out). I have worn the top, but certainly not the pants. Before they used to give out PJs (which was also before I used to travel in J) I always used to change into a light t-shirt and loose shorts for sleeping and I still do that - as I find it more comfortable. In any event most of the flights I take are either on SQ or flights where QF don't hand out PJs (eg QF10 SIN-MEL). Or now a lot of them will be in Y.