I remember a similar thread in the Travel Products (?) forum last year - many recommendations for brands of compression stockings to try and where you can buy them in France or Germany. My best friend lives in Scotland and travels quite a bit- she loves the compression tights (not sure what brand she uses) because they look like the regular black matte tights you might wear with a skirt in the winter.
Personally, I just use regular black knee length on flights but I don't have swelling issues to deal with so cannot help with that specific issue. Good luck!