There are a few things you need in order to create a T-shirt design in Illustrator. First, you’ll need an Illustrator file. Next, you’ll need to create a basic T-shirt design. To begin, create a new document and name it “T-shirtDesign.” Next, select the “Image” tab and click on the “Create Image” button. In the resulting window, enter the following information into the “File Name” field: T-shirtDesign.png In the “Size” field, enter a size of A4 or larger. In the “Format” field, enter PNG for both images. Finally, in the “Description” field, enter your own text or ideas for your shirt design. Click on the “Create Image” button and enjoy your new T-shirt design!