Bra Fitting Guide


Here’s a simple video guide to check that your bra is giving you the best support.


© video owned by The University of Portsmouth’s Research Group in Breast Health

A good bra is so important, as it can reduce breast discomfort, help prevent breast sag and improve your wellbeing, however, many women wear the wrong bra size. This may be because of the confusing bra sizing system, but also our bodies change shape and size over me, so bra size will also change.

The University of Portsmouth’s Research Group in Breast Health is internationally renowned for their pioneering research and testing into breast health and bra science in the world. Here are some more top tips from the team:


  • Bras for sport must be comfortable, fit well and give enough support to limit breast moton and discomfort

  • Look for stronger material, breathable fabrics, wide and adjustable shoulder straps and a wide chest band

  • When buying a new sports bra jump up and down to see how supportive it is!


    If your current bra is too loose in the band, when you buy a bra with a smaller band, you need to increase your cup size. If your current bra is too ght in the band, when you buy a bra with a larger band, you need to decrease your cup size. For example, if you are currently wearing a 36C bra size and the band is too loose, but the cup size ts well, try a 34D.

Fitting Tips

1. Always check the underband

Your bra underband provides 80% of the support you need. This makes finding a bra with the right fitting underband an important endeavor. 

2. Consider the back

Make sure the back is in line with the front. Fasten it on the loosest hook and make sure fits. Since a bra naturally stretches over time, you need to make sure it is fastened on the right hook. 

3. Check the cup height

The cup height of your bra should always not be high under the arms. If it is too high, it may cause discomfort when you wear them.

4. Cup fill

The breast should fit neatly with no excess spilling or no empty spaces left. 

5. Make sure your center-front if perfect

Your center-front should always sit against the chest to fully secure and support the breast correctly. The center-front is the part between both cups of your bra.

6. Always mind the straps

The final part of finding a right fitting bra is adjusting the straps. The straps should be firm, but comfortable. You may need to loosen them up if they are too tight or tightening if they fall off.