You can use any kind of cocktail glass such as a Collins glass, as Lockwood did, or a margarita glass. Even an acrylic cup would work. You might want to consider something with a smooth edge just ...

It's a sugar rim, not a sugar glass," he said. Then, when it comes time to pour your margarita, be sure to do so into the middle of the glass and not near the sides. It might sound obvious ...