i highly recommend you not wire in series.
here is my reasoning, wiring leds in a series does not allow full current to reach the leds so the first led is bright but the ones following are subsequently duller. Go with wiring them in parallel. most standard leds even super brights require a forward current of around 3.3 volts, and a draw of 25milliamps, wiring these in parallel will allow you to run them off a 9volt battery, with only 67ohm resistors if your doing 4 in parallel. (one 47 ohm and one 22 ohm soldiered together).
i had to do major wiring for two costumes in one week, if you need any help let me know.