You will need:
A white t-shirt
Thin red ribbon
A small rectangle of blue fabric (we used felt so it didnt fray)
Cut 7 equal lengths of red ribbon. Glue these horizontally to your t-shirt, leaving a gap equal to the width of the ribbon between them. This should form a rectangle shape which is the base of your flag.
Decorate your blue fabric with the star sequins, and glue it into the top left corner of your flag.
Glue the whole flag onto your T-shirt and enjoy wearing it!