You don't feel great wearing it
Chances are, there's at least one bra in your drawer that makes you feel less than super when you pull it out. Maybe it's an old sports bra, or a demi-bra that is hanging on by a thread. It's the laundry-day bra or the sick day bra.
If the threadbare, worn-out garment bums you out every time you retrieve it from the corner of the bra drawer, consider letting it go. Chances are, you'll never miss it.
[Photo via @negativeunderwear]