If you're using a light-colored fabric, you may be able to trace directly on the fabric. In this case, I'm using a very opaque canvas fabric, so I had to first trace the design on paper, directly from my computer screen.
Don't use a drawing implement that requires too much pressure or that will bleed through onto your monitor. A regular ballpoint pen works just fine.
Becky Stern (sternlab.org is a DIY guru and director of wearable electronics at Adafruit. She publishes a new project video every week and hosts a live show on YouTube. Formerly Becky was Senior Video Producer for MAKE. Becky lives in Brooklyn, NY and belongs to art groups Free Art & Technology (“release early, often, and with rap music”) and Madagascar Institute (“fear is never boring”).