Drop Foot "Cure"
Carolyn,
Over the years I have had great success with over-the-counter lace-up ankle supports. You can find them in your local pharmacy or sporting goods store. There are various brands and varitaions running from around $15 to $30 per foot.
I used to have ACE brand in a nice white rubber-coated canvas with red lining. I have recently replaced those with stylish black ones from McDavid. I have used them for everything from Bowling to Tae Kwon Do.
Best of luck,
Tom