The nature of Photoshop & CorelDRAW is different. PS is an image editing software based on Raster, where CDR is a Graphic Design Software based on Vectors. There has been a mistake. If your design is based on logo or typography or picture or abstract, then it is the best option for a CDR. The illustrator is the simplest choice when the T-Shirt design is made of a logo or text based graphic. Naturally – most of the professional designers will be using both of them before editing Photoshop photographs to add text.Go to site BlackBearMerch and there's everything about T-shirt Design who make on CorelDrawX8.
Any vector software. For me it's CorelDraw all the way. You can work with both raster and vector.