Weight and BMI seem to be irrelevant for my chest. I have frequently worn a 46 jacket with 34 waist pants. Hard to buy that off the rack. My shoulders are very wide so when I did weight 165 people thought I was sick. Probably 175-180 is a great weight for me. Right now I am 195. From more than 30 years of experience I would be shocked if 15 pounds made a difference in the boobs.