Whipstitch

/&+$ 1%" +""!)" ,21 1 ,+ 1%" /01 ) 6"/ ,# # /& +" / 1%" "!$"

Then, insert the needle back in at 2 on the second layer of fabric, angling it so that it pierces both layers of fabric and comes out at ,+ 1%" /01 ) 6"/ 4%"/" 1%" +"51 01&1 % 4&)) "$&+ ,+1&+2" &+ 1%&0

way, working from points 2 to 3, until your pieces are joined.