These pants are nice and loose and have a hidden waist seam. They are really easy to make and look good on most babies (I have made and given away some pairs of them as well). This pair is made out of swimsuit material, which makes surprisingly cute and functional baby pants.
This is made out of a maternity dress that never quite looked right.
I started making these pants because there are some places a baby needs to wear closed-crotch pants to. They actually fit over diapers, or can be worn alone.
The ones made out of terry are great for after swim class, when he is not quite dry but a little bit cold.
Here is the pattern I used: http://doityourselfec.blogspot.com/search/label/Easy%20up%20and%20down%20pants