'Over-washing can damage the elasticity, which is essential for providing the proper support,' Lexie Sachs, product analyst³ in the Textiles Lab at the Good Housekeeping Institute, told Cosmopolitan⁴.

 

Unless you're really sweaty, she suggests waiting three or four wears, approximately ten days depending on the wearer, before washing - but adds that this is also dependent on the activity level of the wearer.

 

So the sports bra that gets worn every day will need more frequent washes than the special occasion lacy balconette bustier that lives in the back of the drawer.

 

'You should have several bras to rotate through to avoid stressing elastic¹ over time, but wearing the same bra two days in a row isn't an issue,' says Sachs.

 

'Taking it off at night should allow plenty of time for it to recover its shape and elasticity. If it can't do that in eight to 12 hours, waiting an extra day won't make a big difference.'

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