I seem to always get issued the L version (even though I'm tall and skinny). I once put them on and walked out of the changing room to show the FA just how ridiculous they looked, the safety hazard they posed and was given a smaller size.

BA L are even worse - I could fit the whole cabin in them with room for Mother.

I've not seen the AA pj's but given the land of the great fat arses, I'm sure they are HUGE but not big enough for some!