Dropping sizes.

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I am not sure if I am in the right place for this topic. But I need some advise from people that have done it already. When I first starting this site I weighed 319 I have lost 48 pounds now so I now weigh 271. My belly went from 60 inches to 53 inches and I have lost one cup size. But my shirts and pants all still fit the same. Not even any looser. Is this normal how much weight did you have to lose before you started dropping your pant sizes.