Lula's Stockinga Cross Stitch Pattern by Shepherd's Bush

I purchased the fabric you suggested for this stocking, however, if I stitch over two threads as the pattern instructions state, their will not be enough fabric. The design will be edge to edge with no room for a seam allowance when cut out.

What exactly is the $20 charm add on for this item? For those items not listing additional add on (thread etc) is there a list of colors to buy at another location when the pattern is received? Thank you.