Roblox is a large-scale multiplayer online game platform that allows users to make and play games developed by others. It debuted in 2006 and has since grown to over 150 million monthly active ...

Much like most things on Roblox, you will be making this yourself from scratch, so you'll need to design a t-shirt in an image and then upload it to Roblox.

Open up the Roblox app, then tap on the middle icon at the bottom of your screen. Then make sure to tap on the "Customize" tab.