Because military bases require motorcyclists to wear hi-viz, Icon makes a neon & reflective vest to go over a jacket that looks a lot more stylish than the average construction worker's. It's mesh, available in orange, yellow, and (weirdly) black, and looks good. It's cut high in front so it doesn't bunch up at the waist if you are leaned over. It has a pocket for your work badge. There's also a women's version, and armored versions. There are similar products from similar companies.

They are not, however, $4.

http://www.revzilla.com/product/icon-mil-spec-mesh-vest