Roblox utilizes images in .png, .jpg, .tga, or .bmp format. You need to right-click and choose Save as and open it with an editing software such as Photoshop, GIMP, or MS Paint.

Image Courtesy: devforum.roblox.com Roblox Transparent Shirt Template PNG with Right Size. To get the Transparent Shirt Template, right-click or long-press on the image above. Choose the ‘Save Image ...