Sewing pattern help

I bought a pattern online without looking at the size, first mistake. I got it in and thought maybe I can size it up. I don't understand the sizing chart because I normally wear a size 14-16 in pants. Is it even worth trying to adjust or should I just return it?

In inches my measurements are; waist 43, hip at the widest part 49 and where my pants usually rest for mid rise pants is 46. I'm new to sewing so I don't really get why the size is so off.

There are two pictures the chart is on the second one. Thanks to anyone who can help.