How could I lose so much weight without losing pounds?

I've been drinking weight loss liquids for months while eating a 2 or 3 normal meals each day and my weight has not lowered but my body fat has decreased a lot. I have to throw out my night gown because what used to be the neckline of my night gown is now reaching the middle of my boobs and wearing it makes me look like a loose woman. The same thing happened in 2019 - I ate low carb and only lost 20 pounds but the neckline of my old shirt began to reach below the bottom of my boobs because I lost so much body fat and the shirt was too loose on me afterwards.

How could I lose so much weight without losing pounds?
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