I have had numerous people ask this and I am not sure if anyone tried it or not. The real question is - can one of these shirts hold up to the heat of an iron. In order to a transfer, you need to preheat your iron (on almost the hottest setting) for 8 to 10 minutes before ironing. If your shirt can withstand the heat (and not melt), then it should work fine. If it would melt the shirt, then no go.
Please come back and let us know if you decide to try it and how it went.