In your seat

It is acceptable to wear light clothes or slippers on board, but stripping down to your underwear or taking off your socks is not.
Taking off your shoes is fine but should be done in a discreet way out of sight of other passengers. Passengers generally take off their shoes during a night flight and wear a warm pair of socks or overshoes.

Use the lavatory to change clothes during a flight.
When you need help from a flight crew, use the button on the seat, lightly wave to them, or silently call them when you have made eye contact with them to avoid disturbing others.

Do not push the back of the seat too much.
Make sure that the back is at the original position during taxing, take-off, landing, and meals.

A pillow and a blanket for sleeping can be found in the overhead bin, but please refrain from using 2 or 3 of them at a time.

Smoking is prohibited in the airplane.

Meals

Return to your seat, open the table, and wait to be served when the crew starts serving meals.

The table must be gently put back to the original position after finishing your meal -- applying too much force to the table may disturb other passengers.

Flying in the air means being subject to 3 times higher atmospheric pressure than that on the ground, which means a glass of alcoholic drink will make you feel 3 times tipsier than on the ground; thus, practice moderation when enjoying a drink in the air..

Lavatory

The lavatory is unisex and should be locked from the inside so that “Occupied” is displayed on the door.
Otherwise, the door will indicate “Vacant,” and it may be opened by another passenger.

Be sure to press the “Toilet Flush” button after using the toilet and clean it with toilet paper if it is still stained after flushing.

No one is allowed to access the lavatory while the safety belt sign is on.
Be sure to return to your seat as soon as you can when the sign is on and put on the safety belt.