To start, check out these handy templates which ROBLOX themselves has created. If you right click and save these images, you can use them as a guide on how the clothes should look once you upload ...

How to make clothes on Roblox: Design your own T-shirts and trousers Your avatar needs to look the part!

In addition to games, players can also create outfits on Roblox and showcase their creations to the world. The platform allows users to design clothes and sell them to others for a price.