T-Shirt Sleeve Template Stud.io part designer?

[carlgustavh]

Hello. I am currently trying to make a minifigure that's wearing a t-shirt. I tried making short sleeves like this

But then it just turns out... wrong... (Image)

I guess i want the short sleeves to stop at where the arm bends but then i need to have the decal at an agle because else it looks like this (image)