Just use the garters from the flashes to hold them up, or better yet, go buy some 1" velcro strips (6- 12 inches long ). Sew them together so that they close like this:



You could also read this informative article by Blu http://www.xmarksthescot.com/articles_id.php?id=8

Rugby socks are okay, but everytime I have seen someone wearing the rugby hose, the hose look translucent. I don't know about you, but socks that people can see through are not my cup of tea. Much too thin for me.