So, as per above, if you have had a significant enough change in shape then we recommend getting your bra fitted.
If you haven’t had a significant change in shape, we still recommend having your bra fitted at least once every two years.
Regular bra fittings will help you ensure you are in the best styles (and sizes!) of bras. to suit your current requirements. Most women stick to their “same old styles” because it’s what they are familiar with. And in most cases, they are missing out on trying news things that may well actually serve them better now. The industry improves year in year out and you don’t want to miss those improvements.
Add to that, that even if your size remains the same, your lifestyle may not. Your life now, may well be very different to what it was 4 years ago. You want your bras to match your current requirements, not your past ones 😆