A few tips to get great results...
The clearer your image is, the better the end result when printed. Please note, if the image is poor quality, the print will be of poor quality. 
  1. Think about the placement and sizing of your artwork on the sweatshirt- a design with lots of detail might work best as an oversize front or back print, rather than a small left chest print.

50% Cotton 50% Polyester, preshrunk 270g/m².