Agree with the Smart Casual concept.
I sometimes also dress in a pair of neat jeans, bur nothing too casual (eg. offensive t-shirts, or torn jeans etc..) I mean this also helps you blend in the environment and all.
Also I usually bring a set of F Class Sleep Suit (or just normal CK
sleep Suit) and slippers on long haul flights. (Makes you feel comfortable and also reduce crush on your clothing) I wish more airline offer this service to J Class ( I can only recall that VS
is the only airline to offer sleep suits to J Class pax, NH
has cabin ware but the quality is ..... however their slippers are not BAD).
I think sometimes in the world it does pay to have some respect and consideration on other pax on the plane (eg. no Fish Sandwiches etc...)
I once remember this arrogant Canadian (sorry If I offended anyone)from a flight HKG
. He took off his socks when he got onto the plane and obviously it had some odour. I mean it was in J Class and the cabin was not too full. It is really hard for other pax and the hostess to comment on anything.
Then when I wanted to go to the bathroom, I went through th middle block of (Airbus config 2x2x2)seats (as the hostess had a duty free trolley on my side) and that guy just screamed at me and said why the F did I went through his seat (when he was actually drinking in the bar and I did not even distrub him or anything).
Anyway, just enjoy your first J Class experience!! I remembered i did!