Only members of the Roblox Builders Club can make shirts and pants but no membership is required to make a T-shirt.

How to Make a Forum on "Roblox". "Roblox" is an online game that allows users to interact with one another, as well as create their own virtual worlds. The game is intended for a younger audience ...

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.