From Peek-a-Boo Pattern Shop:
Every little kid is unbelievably cute in a pair of Lil' Long Johns! This PDF Sewing Pattern features classic long john styling with a faux back flap and button-up front. Includes optional snap closure in sizes newborn-2t for easy diaper changing. Make the Lil' Long Johns extra special for your little one with a fun applique across the back flap.