I'm not sure I can pinpoint what it is about hand-me-downs that I find so endearing. I mean, I know from a practical stand point, it makes sense to share clothes. Especially since babies grow out of things so quickly. But, that's not it.
I think what I love is the sentimentality attached to them. Someone has chosen you to give some of the sweet clothes their own little treasures wore and now you get to put them on your own little one. It's that they come handed down to you, complete with all the love and care and good memories of when their growing baby was the size that yours is now. It's why I'll post Buddy's things all the way to Madison so I can see and remember while I watch Theo, then Emmett and now Rubin wear them.
We love all of the precious clothes we've been given. Some of Ella's favorite dresses are the ones that she calls her lolly-dresses or didi-dresses. I will hang onto them so that when Ella outgrows them, they'll be ready for Cally. Just as I have hung onto this pink linen outfit that was once Emma's and then Ella's and now Cally's.