Hey Stephanie!
As the others have pointed out already, AM makes a great kit for larger folks. And you can trim it to fit any size.
I wish I had done my homework before I bought the kit I did. I'm 6'2" and 260lbs and I have some issues with my ATA Works kit. It is a bit small either in the chest or abdomen, as well as the shoulder bells. My son who is 5' 11" and 175 lbs fits in his ATA Works kit like it was made for him.
Whatever way you go, ask alot of questions, and don't forget to start a build thread so we can see your progress and help out anyway we call.
We love helping new troopers get going! These folks at FISD are a great help. I'm happy I had access when I was working on TK.
Good Luck!