Polyester/cotton refers to the general name of blended fabric of polyester and cotton. It is made of 65%-67% polyester and 33%-35% cotton blended yarn, commonly known as "definitely good". It is a common material for making clothes.
Polyester cotton and cotton polyester are two different materials.
Polyester is a chemical fiber fabric that does not easily wick away perspiration. It feels like a squeaky pull, it is easy to get static electricity, and it looks bright on the slant.