This is a sizing chart like what is used for men's pants.
The first number is the waist size, the second number is the inseam length.
The largest waist size is only 34 inches. Take your waist size measurement and then choose your inseam length.
These jeans are not made in plus size. A 34 inch waist is about a size 12 in woman's sizes.
I noticed that this company does make plus size jeans in normal plus sizes... 18, 20, 22 etc. You can look them up. They are listed seperate from the misses sizes.