Yeah a lot of designer propose black from the head to the toes for the next winter. I need to say that I'm happy because I'm a huge fan of black look (I use it since long time).
But for "well-wearing" a total black look, you need to play with style, accessory and obviously texture.
You can't wear "all black look" if you don't mix texture or had not a nice pair of heel or a nice huge jewellery!
A lot of star already wear the "all black look", like Geneviève Borne in Québec or Victoria Beckam and they do very well! So why not follow the tendance for the end of this winter and for the next one...play with the black (it can be so rock, fancy and feminine!)