Inside Roblox Studio, you can create new games by clicking + New tab on the left hand bar. This will bring up a series of templates for you to work from that can be sorted by theme or gameplay style.

Create an image that’s ideally 512x512 pixels and then upload it to ROBLOX via the Asset Manager in ROBLOX Studio. As T-Shirts are just a square decal as opposed to a full shirt, there isn’t ...