It’s worth noting that you can access extra Admin commands, as opposed to the original ROBLOX Admin commands, by adding an admin command Pack to your game (such as HD Admin).

Unleash chaos with these admin console commands in Roblox: Steal a Meme. Here's a list of these commands, along with a guide on how to use them.

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.