You could also use mini led wire lights. I used them for my outfits at edc last year. The battery pack is pretty small and they come in different colors. I think there's a guy on etsy that sells them. Here's an example from Amazon http://www.amazon.com/gp/aw/d/B017SMQV1E/ref=mp_s_a_1_11?qid=1463329802&sr=8-11&pi=AC_SX236_SY340_FMwebp_QL65&keywords=mini+led+wire+lights