Will I Have Loose Skin If I Lose 7 Stones After Having A Gastric Band

I currently weigh close to 15 stones. I'm 5'5 and have a BMI of approximately 34. I think I have a very big tummy. There are white stretch marks on it (which I'm not that bothered about) but I am scared of having loose skin. It looks like I am pregnant after I eat or drink anything. My tummy tends to protrude right out (like a pregnant woman) but there is also a slight overhang. Will people with overhangs almost definitely get loose skin if they were going to lose approximately 7 stones? I am hoping to get a gastric band but have yet to see the surgeon. I have heard that gradual weight loss, toning exercises and rubbing various scrubs into skin, as well as moisturizing, helps to reduce loose skin. However, is there any way to tell in advance if loose skin is going to be a problem? I am worried about my breasts as well... I'm around a 40 C at present. Does anyone have the experience of sagging skin after losing a lot of weight? Thanks, N.