I got an FX too. Sitting on a stool is no problem. Actually, I drove my car while wearing my chest, back, ab & kidney. I'm 5'7, I did some trimming to my chest piece because at first I wasn't able to see the buttons and details on the ab section. I separated the cod piece from the rest of the ab section and took off about an inch and a quarter. I took the same amount off the kidney section too which is also two pieces (butt & kidney). I guess if I trimmed my leg pieces I could safely operate a vehicle and sit down all the way.