On the Roblox website, there are several templates. One can use those PNG files, which have a transparent background, as inspiration while creating the design for the shirt.

How to Make T-Shirts in ROBLOX T-Shirts are the easiest clothing to make in ROBLOX. Create an image that’s ideally 512x512 pixels and then upload it to ROBLOX via the Asset Manager in ROBLOX Studio.