Any fonts that are licensed for sync use on Typekit may be used on a T-shirt or other product design. Here's a reference from the synced fonts section of the Typekit licensing help page:
"Can I use the fonts to create products I will sell commercially, such as t-shirts, posters, or other printed merchandise?
Yes. You can use synced fonts for any kind of merchandise, whether you’re designing a t-shirt for a friend or product packaging for a client."
I hope that this helps; let us know if you have any other questions,