Thank you Seamus. I'm just heading out for a day of shopping , so I'll let everyone know how I make out.

One additional suggestion: you can get a two-chambered inflatable pillow-thingie that lets you "walk" while sitting down--air is forced from one side into the other, helping you increase circulation in your legs. I've used this on several trips, and it helps when it's difficult to get up and move about in the aisles. You can find them in the Magellan catalogue.

Ok, folks, I bought my "stockings". I bought them at the HOme Health Care store affiliated with my local drug Store ( Shopper's Drug Mart, Canada) and the girl there was very helpful.
I bought knee highs , which come in diffent colours and sizes. The brand name is Sigvaris Graduated Support Stockings. The package says, "15-20 mmHg is applied to an average ankle circumference". They are made in the USA and the box says "sigvaris is a registered trademark of a Swiss company.
ANyway, I'm all set, and hope the information is helpfull to others.

Hi again Kodi.
Let us know how you get on with the stockings on the flight. This information is always useful. You only need to take a bag of something like Doritos on board a plane and then watch them expand when in the air to see the pressure drop in the cabin during a flight. Anything that prevents your feet doing something similar has to be an advantage to maintaining the blood circulation flowing as freely as possible.
Have a great trip.

ok AR, I'll let you know. Nest week I'm taking a 4 hour flight to Calgary, so it will be a good practice run for NZ. I'm anxious to see how they feel. I don't usually have a problem but know my feet swell a bit. I always have to really push my shoes back on at the end of a flight!