I made this baby Pebbles costume for my daughter in 2007! The entire thing is hand made and she was shoeless like a stone age baby! The necklace was made using wooden painted larger round beads over a crafts round necklace I got at the crafts store.
The plastic bat was the perfect touch. The hair clip was made using a craft clip which I glued the wooden cut out bone onto. Velcro would also work depending on the thickness of any clip, but this was glued using a hot glue gun.
The clothing was so easy - you can buy material and sew or luck out like I did. I found a one dollar top and cut it dinosaur teeth at the bottom and cut the neck out and I used a Velcro tape in the back.