My annual Medical Compression course to be a Certified Fitter, really emphasized the travel market and pregnancy for leg wellness. Travelers always come to me before taking a trip and ask me to help them with leg fatigue and walking.
Also, many pregnant women try to work as long as they can with the added pressure and weight on their varicose veins. Compression makes a big difference. It is also a preventative measure for standing or sitting all day, even in a wheelchair.