You could use hot fix gems, glue them on (E6000 is good, but work in a ventilated area), or use sew on gems.
This costume should be possible to make. Good luck
Interested in commissioning a costume or accessory from me? Go to my Facebook page for more information
Alternatively, order an accessory or some clothing from my Etsy store.
Etsy Deviantart Blog
Currently Working On:
Female Titan (touch ups);
Daenerys (Game of Thrones), Hannah Alexander's Art Nouveau Sailor Moon (long term project), Marianne (Brotherhood of the Wolf)