So you find the bra you like, you wear it too death, and now over the time the elastic has stretched and it no longer gives you the support you need.
Your options, well there is only one, that's to buy a new bra right? Or is there another solution? Well yes, there is. There is a trick you can do to tighten the elastic. Grab yourself an iron, turn it to the highest temperature and steam and press the elastic for a few seconds. Just like an elastic band shrinks when you apply heat so does the elastic in your bra.
It's the trick used by sample machinists when they've gone over the measurements set by the designer in the spec, but it also works well on a worn bra.
Though it doesn't shrink by a great amount you can each wing smaller by 8-13mm, which are wings are typically graded by 1.25-1.5, shrinking it this much is a half to a full size .