Thankyou! I understand it a little better now haha!
Could have to do with muscle mass, your height, frame size or even something as simple as how tight/loose the clothing is. Taller people can carry more weight. I'm only 5' tall and weigh 150 lbs; takes a size 10-12 (depending on style) to be comfortable; however someone who is 5'7" could easily weigh 150 lbs and wear a smaller size.