BigMike,

I made t-shirts for my sons some years ago using a nice jpeg image and making a heat transfer, which I then ironed onto the shirts. The job was very easy and the results were more than satisfactory.

Here is one of the shirts today. The shield actually looks much better than in this picture, which appears rather faded and bright:


If you can get a really good quality emblazonment (painting/drawing) of the coat of arms, you should have no problems making great t-shirts. I might want to follow the advice of thescot and cajunscot and asume arms of your own, since you are an American. You can certainly incorporate elements from the "original" grant into yours, but make it distinctly your own. Many, many resources are available to you if you want to go down this road. Heraldists love to help out!

Cheers,
Sandford