Wetsuit question (probably a stupid one!)

Hey so as the title suggests i will more than likely look daft after asking this but still
...when looking at the size chart for a ladies wetsuit, where it has the chest measurement, does it mean the measurement you'd be if you measured with a tape measure, or the measurement you'd take in like bra sizes?
so if in a bra if i take a 34, which (for anyone who doesn't know) means it's 30" round on a tape measure.. if it says 34" chest does that mean it's gonna be right cos its the same as bra sizes or gonna be 4 inches too big cos it goes off the actual measurement?
i know it probably sounds stupid but i'm really confused lol and don't want it to be wrong!


