I think some designer has been looking at Mary Quant stuff from the late Sixties. She did some translucent (not clear) zip up the back shortie boots. I was living in Canada at the time, my mum sent me a pair as I was working at The Bay (department store chain) and she thought my boss would be interested. The whole store were interested!!
I wore them in the snow (with socks!) and the zips rusted over. Fun and very avant garde at the time though!