The high-tech, cold weather gear I use for temperatures in the forties are cotton socks under sneakers, jeans, and a cotton t-shirt under a cotton sweat shirt. If it's rainy, I wear a layer of light weight poly-pro long-johns under the jeans and sweatshirt. Low forties may call for light gloves.
Low fifties: jeans, and sweatshirt.
High fifties: light sweat shirt and shorts.
60 and above: shorts and t-shirt.
Below 40: light weight poly-pro long-johns under the jeans and sweatshirt, heavy knee length socks under sneakers, woven synthetic fiber gloves under pig skin work gloves, wind proof, light weight ski-mask. If it's rainy, I wear a layer of heavier poly-pro long-johns, but it's rare for it to be rainy and that cold around here.
Mid 30's to mid 20's: heavy weight poly-pro long-johns under the jeans and sweatshirt, heavy knee length socks under sneakers, woven synthetic fiber gloves under pig skin work gloves, wind proof, light weight ski-mask.