It's not possible to sublimate onto dark surfaces or cotton fabrics directly which is why Siser EasySubli has become a popular choice for those who don't want to be limited.
With a Sawgrass sublimation printer you can print directly onto EasySubli and then cut around the image, but Siser EasySubli - which is basically sublimation HTV - can't be fed into an Epson printer and printed on directly which means you have to take several extra steps.
I'm going to say right up front I don't recommend this method. It's time consuming and cumbersome and if you are doing this on the regular, there are far better processes and printers available that will increase your production and give you a better quality.
With that said, follow this advanced Silhouette tutorial for details on how to use EasySubli with an Epson sublimation printer.