this season's fashion trend

This fall/winter in our city there seems to be one prominent fashion trend that I just can't understand.  It is apparently completely acceptable to leave your house wearing only pantyhose on your bottom half.  Granted, sometimes the ladies are wearing a long sweater or jacket, but not long enough to make the fact that they're not wearing pants ok.  You also need to know that one major form of transportation is bike or scooter/motorbike which requires a great deal of leg movement to get on and off, making their entire backside visible to anyone who may be passing by.  You may be thinking.....maybe they're really tights or leggings.  Nope.  They are definitely pantyhose.  Another reason I don't understand it is because it's already below freezing here.  When I worked at the hotel it was common for the ladies to wear multiple pairs of tights or a pair of thermals under their tights (as we were lectured by the higher ups about how many layers and what kind/color of tights were acceptable for the work environment.  This year's fashion trend enthusiasts clearly didn't work at the hotel because, I promise you, there are no layers.  I just keep waiting for the day it really will be to cold for the trend to continue.  Sheesh.