ELI5: Explain Like I'm 5

Bustline

The bustline is the part of a person's body that is covered by their shirt or dress. It's basically the area around your chest where your boobs are. Some people have large bustlines and some people have small ones, and it's normal for everyone to be different. Sometimes when people wear clothes that are too small, their bustline looks bigger than it really is. But it's important to remember that everyone's bustline is perfect just the way it is!
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