I am SO BUMMED that this doesn’t fit me! I wear a 10F bra (AUS/NZ size), and I got a size M to make sure the straps would be tight enough to hold me in (I do prefer my sports bras/tops to be as tight as possible), but unfortunately it wasn’t holding anything in. The cups are obvi too slightly too small for my bust size, but again, I got M to ensure tightness. But, while it doesn’t fit me, if you have a more proportionate bust to waist ratio, I’m sure your usual size would be fine!