here's a link to a FAQ about foiling fabric and i've attached a PDF file thats a tute on how to do it.
its all pretty much the same idea, you use an adhesive (powder, fusible web, liquid glue), make your design with the adhesive, and then apply the foiling over the adhesive.
i use a baby spoon to press the foil down onto the adhesive.
http://www.softexpressions.com/help/faq/FAQfoiling.htm