Skinny jeans.
I wear them all the time although fashionistas says they are out.. but, whatever. ;]
According to certain magazines, everything is 'out' almost before it even hits the shelves; so I don't worry, either!
If we want to still have a world, with some dry land on it, to live in in 20 years, we need to stop being told that things are 'in' one season, 'out' the next and then 'in' again the next (or stop believing it! ).
Fast fashion is 'out' IMO.