Just got new bras and the woman in the lingerie department helped and then told me I was getting a size too small and I was actually a 34D but I'm on 15! The bras are ok but some are hideous and massive with a 3 clasp back, I'm not comfortable with it and it's so strange I thought I was a 34B/36C (saying as they're sister sizes) is it normal that they're that big and I'm only 15 and 5'9? Feel like it looks weird on my figure