Tune In · 7/24/2026
Know Your Sister Size
Learn how sister sizing helps you find a comfortable alternative when your usual bra size is unavailable.
What is a sister size?
Sister sizes use a different band and cup combination while preserving a similar cup volume. They can help when the band feels too firm or too loose.
How to adjust
- Go up one band size and down one cup letter.
- Go down one band size and up one cup letter.
- Always confirm the fit at the band, centre gore, and cup edge.