This one can be adapted to sew the bottom closed; leave the top shoulder and neckline open and sew ribbons on at the end of sleeves, shoulder, and neck opening. Sew under the arms and down the sides. The bottom can be stitched closed. Turn gown right side out and press seams. Lace can be added or omitted. Thin ribbon sewn on for ties at the top as shown below in my rough diagram. This can be made in any size needed.
I have made the above gown in the past for tiny babies and it is very easy. A simple bonnet can be made with a band of the same material, about 6 inches long and 4 inches wide, with ties. Cut two bands, sew them together, leaving one end open. Turn right side out and sew open end closed after turning in rough edges. Press seams flat. This is just wrapped over the baby's head and tied under the chin. It can be edged with delicate lace if desired.
A Burial Pouch is nice to put the baby in after dressing with the gown and bonnet:
Something Precious Burial Pouch
Burial Pouch Another good site for ideas is:
Bundles of Love A good source of material for these baby gowns is donated wedding dresses.
Hope this helps you.