Yes, Zivame bras are always true to size unless mentioned otherwise. Here is how you can measure your Zivame bra size:
Wrap measuring tape snugly under your breast and note down the measurements in centimetres (cms). This is referred to as the underbust measurement.
Then start measuring your cup size with the tape by wrapping it around the fullest part of your breast and note the nearest whole number in centimetres. This is referred to as the overbust measurement.
Finally, check for the size chart given in the filter section on Myntra and select your desired size by matching the underbust and overbust measurements with ease.