If you want an entertaining, creative activity for your children during a summer afternoon, then create a template of a soccer or bike jersey that your children can decorate and use as inspiration for the future. You can print a blank jersey template from a website with free templates. You then can use it to make your own larger, cardboard version.
Visit a website offering free, printable jersey templates such as Jersey Database, Retro Back, Twisty Noodle's colouring pages, and Lucy Learns.
Place the printout on your work space. Place a piece of cardboard that you cut away from an old box. You also can use a shoebox.
Sketch a larger, free-form shirt jersey on the cardboard. You also cutout the printout jersey and trace it on the cardboard.
Cut out your jersey tracing from the cardboard. Your children can use it to trace blank jersey forms on other pieces of craft paper and to decorate it with markers and other art supplies.