LEDs for a robot costume

I would also suggest that you implement BLINK M led's , these are LED's with virtually every existent color on earth in them and Plus the animations they provide are just outrageously staggering, i love these however a bit costly but you will love them(They have uC in them! ]:D)
Have a look on them by searching simply BLINK M on google they are provided by the company THINK-M