Reflective Vest 3M
Its light-weight (90mg total!) polyester knitted jersey material, so it can be worn over other clothing without being too hot.
They are tailored cut, as you can see in the size chart below.
All the measurements in the tables below are taken with the garment laid flat. The garment is also machine washable, (just don't dry it too hot,since that will melt the adhesive and loosen the reflective tape.)
The polyester jersey material is smooth and comfortable to wear. The material's open knit construction allows air and moisture to pass through, so you don't overheat.