I finished Asa's first gown in a looooong time this past week. It's made in the "infant bodice" style that was very popular in the 1860's. I had to refit him due to his growth since the last batch of gowns that I sewed for him 3 or so months ago.
Though you can't really see it in these pictures, the bodice is directionally pleated on the red stripes. The neckline has a bias casing with a draw string closure for maximum adjustability and the waistband has a hook and eye, there are no other closures on the gown.
The bodice has one stripe of trim to hold the pleats in place, the waistband consists of 2 stripes and the skirt trim is 3 stripes. It is actually mid to lower calf length, not the floor length that it appears here.