Review on U S Polo Assn Multi Classic Men's Clothing in Shirts by Tyler Suarez

I don't know why all size charts are the same in every US polo shirt while in real life they are very different. I used to buy a lot of US polo shirts but every time I get another one the shirt size is either too small or too big even though they have the same size charts and I always wear a medium size for example is this one too big for a medium size.