Hopefully someone who has flown with Virgin can tell you if they are the correct ones to wear.
When I flew to Oz with Virgin (I still can't believe I did a direct flight) I just got a pair of ordinary socks to walk about in, two designs, either black with red heels and toes or black with purple heels/toes and other bits like a toothbrush/paste, eye mask and ear plugs, which are all wrapped up in a black bag with "shoe bag" written on it....obviously to pop your shoes in.
They're def not compression socks, I used mine for walking about the apartment in, and I have some here unused, if they were compression socks they would cause your legs to go like a balloon because they stop above the ankle joint/lower calf like ordinary socks do .....
Basic bandaging techniques from my younger days when bandaging a limb, the bandage should always go to the next joint EG: finger/palm of hand to elbow and in this case, either toe to knee or toe to groin....same applies to compression stocking, hence the correct term is stockings and not socks.
I never noticed if my ankles/feet had swollen....must have helped having them elevated on the footstool.?