I'm wearing bras that I've had for 3 years and they're still like new. I wish I had to wash them every few days because that'd mean I got rid of this super dry skin.Even for people who don't sweat much, body oils will still degrade the elastics in bra fabrics. Coupled with constant stress of several days wear, bras will wear out faster. "Resting" a bra for a day after wearing (alternating wear method) helps to prolong life, but wearing once and washing works better. I use just a tiny bit of laundry detergent in my bra washing loads, so my bras are mostly getting rinsed.