Is this illegal in designs for t-shirts?

ive been planning to print the design of the t-shirts found online.. like logos, designs from the a band's merchandise... for my own design in making a t-shirt. likewise i wanted to buy, but still i dont have credit cards to purchase online so i decide just to print the design, get a plain t-shirt, and get it print... is this illegal or is it ok..? btw i lived in asia...