Contrast the jacket with a light-colored helmet, or put reflective stripes on your helmet. Some of the newer biker gear has reflective stripes built into it that do not ruin the overall look of the gear. It is the biker's responsibility to ensure she is seen by other vehicles on the road. While riding during the day it is a good idea to use the high beam of the motorbike's headlight. The high beam is not going to hurt anyone, just remember to switch back to low beam as the sun sets.
Some motorcyclists install a modulator on their headlight.
A modulator varies the low beam between dim and normal so the headlight looks as if it is pulsing or flashing. Modulators are illegal after dark in California, so check the laws in your area. Let other people know your intentions by signalling well in advance of turning. Remember to cancel the signal after making the turn, otherwise drivers will pull out just when they think the bike should be turning. Flashing the brake light also improves a motorcyclist's visibility.