Two ways that I would suggest:
1. Scan all of the pictures into your computer and print them onto printable fabric sheets, following the manufacturer's directions.
2. Have each child draw his/her picture on paper with Caran d'ache oil crayons (hope the spelling is OK). You then turn the paper over, face down onto COTTON material and iron it. The picture will transfer onto the cotton material.
Hope you have fun and success.