One of the goals of plus size women is to decrease their weight as well as their size.  So they will be able to wear size 2 or even a size 0.  However, this is easier said than done.  So these women look for Plus Size Womens clothing instead.  It is much more achievable to shop for clothes than to lose weight. 

There are many reasons why women have plus sizes.  It can be due to metabolism, they have slow metabolism or they can have hypothyroidism which have caused them to gain weight fast.  It could be because of the food intake, the quantity and the quality.