Do you stick your bras in an underwear drawer? Fold them in half and stuff them under a pile of laundry? Your bra storage techniques could be dramatically shortening your bra lifespan!
To get the longest wear out of your bras, you should store them in a manner that doesn't damage their structural integrity. Something like a three-part soft cup bra, you can get away with folding and hiding away in a drawer somewhere - as long as you're not putting any strain on the seams or the straps, or storing it under something heavy.
A bra style that has structure, though, like a pre-formed bra cup (molded cup bra, seamless bra) or an underwire bra has to be stored carefully to avoid putting stress on the bra and reducing its lifespan.
A good rule of thumb is to store all of your bras with the band hooked, neatly stacked flat in a drawer or bra storage box. Avoid putting any stress on underwires or other structural elements.
For molded cup bras or pre-formed bra cups, you should store these bras with the cups properly shaped. You can nest these bras as long as you don't wrinkle or deform the cups. NEVER fold one cup into the other and invert the cup, as this can cause irreversible damage. For more info on caring for molded cups and pre-formed bras, check out: Taking Care of Molded Cup Bras, Seamless Bras and Pre-Formed Bras.
Taking Care of Your Bras
Washing Your Bras
Storing Your Bras
Caring For Underwire Bras
Caring For Molded Cups