Avonlea22,
I sewed one male end to one female end. I have flipped on the male end, so that when you wrap the velcro around you calf it will attach. We used to have something similar to hold up our shin guards and socks in hockey.

I have added little strips of velcro to the grosgrain so that I just attach it to the female end of the strip, wrap the male end around, and I now have interchangeable flashes. I now have a red set, a MacKenzie set (thanks Bear!), and a green set. All this for under $20 cdn, and I have enough for a few more. I will take pictures tonight and upload them tomorrow am so that you can see what I mean.

JohnAllen,
I bought my sewing velcro from a craft store and it was the one width they carried. If you go to a fabric store than, yes you are right, the velcro will range from 1/4 inch to 5 inches. I would say that the velcro I used is about an inch. I would not go any bigger that 1.5 to 2 inches as show more under the hose. I would also not go under 1 inch in width.