St-walkers - pronounced street walkers - are elasticated suspenders that attach around the heel of the shoe and around the wearer's ankle, making the shoe more secure.
They are decorated with Swarovski crystals, black bows or 'high-visibility' jewels.
Milana, 45, had the idea after his clients and female friends kept complaining about the problem.
"I'd been thinking about what I term the "Cinderella Syndrome" which women often suffer when their stilettos slip off at the most inconvenient moments - usually when they're in a rush," the Daily Mail quoted Milana, from Brighton, as saying.
"I also thought about all the health issues of ill-fitting shoes, and wanted to try to find a solution.
"It's something they can keep in their handbags and then easily slip on to their heels - it even means they can run for a bus," Milana added.
Milana tested 100 types of elastic to find one that was strong enough but wouldn't leave a mark around the ankle.
He said: "I trialled them for about two years on my friends and bridal clients. The inspiration came from a strap that connects from a ski to the user's boot to ensure the ski doesn't get lost in heavy snow after a fall."
St-walkers are available to buy on eBay for 4.95 pounds plus 1.20 pounds postage.