Panel size is really dependent on the size of your shirts and the size of your graphics. As a very basic rule, 8x8 works great for onesies and small youth clothing, 12x12 is very well suited for men's and women's shirts, and 14x14 is often good for XL and XXL T-shirts.
However, this works on a very case by case basis. Our recommendation is to measure your shirts. We need the following amounts of material to work with for each panel size.
|8x8||8 1/2 by 8 1/2 inches|
|12x12||12 1/2 by 12 1/2 inches|
|14x14||14 1/2 by 14 1/2 inches|
You can simply measure your shirts with a ruler and decide whether your graphic would fit better in a larger panel size or if the size of shirt calls for a smaller panel size.
If you have any questions or concerns at any point, our team is happy to help. Email us at email@example.com or give us a call at (855) 792-4205.