If you know how to sew it should not be too dificult to make a flower costume for Halloween. The following website provides details about making flower costumes: sewing.about.com/library/weekly/aa101497.htm
You can create your child's costume with out being an amazing sewing machine. Here is a great article on how to create a fire fighter costume with out sewing. http://stopdropandblog.com/2009/10/13/how-to-make-a-sew-free-firefighter-costume/
See the links below:
Easy,get some Fabric,and start Sewing.
A Sewing Machine And Cloth And Maybe Markers.
Needle and thread...
There are several princess costume patterns in the Halloween McCall's patterns. They have a variety of choices depending on what your sewing experience is.
You can find a bat costume for babies in the McCall's patterns at WalMart or Hobby Lobby. Family Fun magazine also has a simple bat costume template on their website.
You can make a Geico Gecko costume by sewing green felt together. Sew this felt into the shape of a lizard's body.
Try felt material and hot glue.
pink and silver fabric and a sewing machine
Well you basically get some materials after annaylising the costume and then just finally make the costume. If you are not very good with sewing and other stuff like that try getting a ready made costume from a costume shop. Just ask peopple.
I found athttp://www.buycostumes.com under "flower" there are costumes for kids and for adults. They are a good price and they look good. You can make your own costume if you want.