Great safety wear for both daytime and nighttime walking and bike riding is a yellow/orange road construction safety vest with reflective banding crisscross and around front and back. Cathcart makes a very light one which is punched throughout with small holes to avoid heat buildup. It is feather light. They have valcro tabs down the front so its easy on/off.
Walking at night we've been mistaken for utility crews looking for a trouble spot; so they reflect well, people spot us by light reflecting from their windows..
We bought ours up North for $8 each in a Tractor Supply type of store which caters to farm and outside workers.
When walking at night it won't hurt to have a flashing red light clipped front and back and a good flashlight to beam at approaching traffic.