Joann's, and Simplicity 2205 was one of our finds.
The pattern was very clear except it doesn't tell you specifically what kind of interfacing to use. She used Shape-Flex for the pockets and the lining, fusible fleece for the outside, and a fusible mid weight for the straps and flap. If she makes this purse again, she will use a stiff interfacing for the flap to help keep its shape. (BTW, Sara at Sewsweetness has a very helpful post here about bag interfacing.)
Here's a peek inside at her red polka dot lining:
Thank goodness my daughter gets her cast off soon. She's moved from wanting to sew something to wanting to build some furniture for her room :O