Nothing wrong with going back to basics from time to time.  My Basic Knit Cup Cozy is a one piece cozy that slides onto a cup with ease. It fits a standard take-out cup for your coffee, tea or hot chocolate.

This cup cozy features a smooth stockinette center bordered by ribbing on the top and bottom.  It is knit as a flat panel with a few increases then seamed to create a tapered sleeve that gives a secure fit.