Working in a Bridal Shop, I see it all the time. Customers come in knowing they wear a particular size and get seriously offended when that number creeps up in the dress the pick for their special day.
First, bridal designer tend to design with a smaller frame in mind so their sizing is going to be a tad big smaller than garments sized for active wear. Second, all sizing is based off measurements. If you just pay attention to your measurements, you won’t need to fret over general sizes.
Please don’t get wrapped up in sizes…designers/companies make up their own sizing charts..