I also used the japanese pattern book (referred to by Ellen below) to make some baby onesies. I thought a bit about how to make the pattern transfer. I first traced the pattern onto regular notebook paper. Then, on two of the onesies, I used a tracing paper/tracing wheel set for fabric and a ballpoint pen to push the pattern through the tracing paper onto the fabric when the wheel could not catch the necessary detail. For the rather un-detailed rainbow onesie, I just traced the pattern onto a piece of notebook paper and sewed the paper onto the shirt to get the main pattern (before filling in with color etc). The paper was pretty easy to tear away.