yeah, thanks for advise.
however, i read somewhere to use the "histogram on the right side" method.
that is contrary to what you mentioned.
so does that meant that for white subjects, the above method does not work?
Perhaps you meant that the "proper" exposure thing, which tells you to spot meter white at +2EV in order to get white. But if you're shooting a wedding theme/gown, I would suppose details for white dress/gown is important to retain, and that's why you should shoot in RAW (and underexpose white). Cos at PP, you get greater freedom to do what you like to visualise your work, and you still have the details of the white gown.