I have a very good quality suit that I only wore for job interviews that I'll never fit into again. A few years ago I made enquiries with a couple of "dress agencies" (i.e posh second hand shops) and they said that suits just weren't selling as it wasn't the sort of thing their customers bought.
I had it listed on Ebay for a while but it didn't sell, and anyway I felt a bit nervous about it as I usually only sell cheaper items.
Apparently suits came back into fashion last year, but at the same time a lot of job interviews at the moment are happening online so I just don't know if there's any market for it.
Is there anywhere I might have some luck or are people just not going to be buying suits any more?