I assume a fair amount of donations haven't been sorted through at all by the donators. They likely just already have large bags of clothes that no one wears an

I assume a fair amount of donations haven't been sorted through at all by the donators. They likely just already have large bags of clothes that no one wears anymore for any given reason and don't take the time to determine what is and isn't donatable. I know that's what's been done by my family when a family member dies. There's maybe a couple separate pieces that get saved for sentimental reasons (I have my grandpa's wedding tuxedo jacket for example) but everything else pretty much gets dumped into bags and sent off.