My grandparents stopped by this morning, so the rest of the tute is going to have to wait a day or two, but you’ll need time for your paint to dry anyway, right?
The flap piece for the bag measures 14” w X 13.5” h. You’ll notice that I had mine turned the wrong way, so my keys are at a different angle on the actual bag.
Here is a link to the piano keys template. It’s only one octave. You can repeat as necessary.
To get the same look as on my bag, you’ll want to trace the whole thing onto freezer paper TWICE. Then, cut out just the white keys. Place and iron them onto your fabric individually, leaving small even gaps between them…like this:
Then, take a piece of freezer paper for the top and place the straight edge an even distance from the tops of the keys. Iron in place. Do the same with a piece along the bottoms of the keys.
Paint and let dry.
Freezer Paper Primer here.