Several years ago, there was a thread in this forum about packing worn-out "throw away" clothes for your journey and then leaving them behind in your hotel when you left. The general consensus, which I agreed with, is that we shouldn't leave such clothes behind because it just creates trash for the country you were visiting. IMHO, it also doesn't reflect well that American's would leave their trash for someone else to deal with.
I find myself now with some very nice clothes that I simply don't wear very often. I am considering the idea of wearing them on my upcoming trip to Europe and then leaving them behind with a note to hotel staff to either keep, give away, donate or sell them through a re-sale shop. Whatever they might want to do! Some of them are designer clothes like Michael Kors, Burberry, or Ralph Lauren, but I find them a bit itchy or the color isn't the right shade of blue, etc.
I'd be interested in this group's reaction to this idea. It would certainly reduce the weight of my luggage coming home, and maybe I could even buy a few things to wear that I really like!