Hello! I’m no professional at designing clothes but I thought I could give it a go,
I created a super basic shirt that doesn’t look good but I can’t figure out how to test it on a character without uploading it, I don’t want to waste my Robux.
Go to studio. Open a place and insert an npc. Then insert a shirt into the model. After that, upload the shirt to studio as a decal and put the decal ID into the shirt ID. Make sure you publish the place beforehand and check it out in-game as studio unnecessarily blurs the shirts.
Yes! First upload your decal onto roblox, copy paste the id of your decal, then insert a character/dummy into studio, go into ‘Shirt’ and change ‘Template’ to your decal!