CT, FWIW, I wear and wash them over and over… They are the unsinkable mollies of leg wear - indestructible. Plus, they feel very silky and don’t snag (the latter probably explains why they are so sturdy). Of course, the higher the denier, the sturdier they are, but even the low denier ones still last a long time compared with Donna Karan and CK.
If I get 5 wears out of a $30 pair, I’m still ahead compared to one wear out of $15 pair (not counting the irritation that comes with discovering a “ladder”, as the British call them).