Instructions
Go to the ROBLOX wiki and download the ROBLOX transparent shirt template by saving it to your computer.
Open the template in image editing software, such as Microsoft Paint, Photoshop or the free application at pixlr.com.
Draw a design on the empty white panels or paste an image onto the panels. By default, the clothing in this template is entirely transparent. Anything added to the white panels will show up as opaque rather than transparent. For an entirely transparent or naked character model, do not make any changes.
Save the modified shirt as a new file. Do not overwrite the original template file.
Visit the ROBLOX website and click on the ̶0;Character Customization̶1; page.
Click the ̶0;Upload̶1; button to transfer the shirt file from your computer to the ROBLOX website.
Assign your shirt to a character model by clicking on a model after the upload is complete.