It’s a well-known fact that sizes are not always the same across brands. Bra sizing, which requires such a precise fit, can be particularly tricky, so it’s important to take the appropriate steps to ensure the right size. The best way to start: “Measure yourself,” says Campello, and follow the size chart at hand. “Read it carefully, follow the Fit Guide tips, and don’t try to ‘make it work’ when your size is not listed in the chart. Your best fit is always going to be your true size.”